From Wikipedia & RPG-D
NB. I have left out most of the words associated with muggle technology.
Words
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A-K
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Agony Aunt the advice column in a magazine
Alright (alright? arright?) a question and informal greeting. A slang version of "Are you well?"
Anorak a raincoat. Slang term for a geeks with interests in niche subjects such as trainspotting.
Argy-bargy any type of disagreement, ranging from verbal to physical violence
Arse your bottom. What Americans call an 'ass'
Ass lit: a mule. slang: An idiot or dimwitted person
Balls-up a blunder or mistake
Banger 1. a sausage 2. a small firework
Bap 1. a soft, white, floury bread roll 2. (chief. N. Ireland) a person's head
Barney a small quarrel
Barrister the only type of lawyer qualified to argue cases in both higher and lower courts.
Bedsit a one-room flat that serves as kitchen, living and bedroom with shared bathroom facilities
Bell end lit: penis. slang: A male-oriented insult.
Bender a drinking binge or pub crawl.
Berk a silly person
Bespoke custom made
Biccie a biscuit
Bint derogatory term for a woman. Ranges in harshness.
Black pudding blood sausage
Bladdered drunk
Blag to achieve by deception. A scam or tall story. {this is also the name of a quidditch foul}
Bleeder a derogatory term for a man, especially one who acts irritatingly or irresponsibly.
Bleeding (bleedin') Northern alternative to "bloody"
Blimey an exclamation of surprise. Also cor blimey.
Bloke a man
Bloody used to express anger or for emphasis. "bloody hell"
Blooming (bloomin') A less coarse alternative to bloody
Bobby a police officer
Bodge to ruin, to make a bad job of.
Boffin a science or engineering nerd.
Bog the toilet
Bog roll toilet paper
Bog-standard ordinary, run-of-the-mill
Boiled sweet a type of confection. Hard candy.
Bollocks lit: testicles slang: A load of (verbal) rubbish.
Bone idle lazy
Bonk have sex with
Breaky breakfast
Brolly umberella
Bugger a mild insult. Typically used with a modifying adjective; you would call someone a "clever bugger" or a "silly little bugger".
Buggered lit: sodomised slang: worn out, lacks motivation (as in "can't be buggered")
Bugger all absolutely nothing
Bully sarcastic term for good. "Bully for you!"
Butty a sandwich. Especially one made of hot chips.
Cack poo. "Cack your pants" can also be used to describe someone talking a lot of nonsense.
Caff short for cafe.
Candy floss cotton candy
Chancer an opportunist
Chav originally from Northern England, now used nationally. A derogatory word to denoted the nouveau riche or working class person who wears designer copies, fake gold bling and is a trouble maker.
Cheek/ Cheeky impertinent. A child answering back to an adult would be told not to be so cheeky. A young adult can be reminded to respect their superiors by being told not to give any cheek.
Cheerio an informal farewell.
Chemist a pharmacy or drug store
Chicken/ Chook term of endearment, typically used by adults toward children
Chimney pot The cylindrical, topmost part of a chimney, where the smoke comes out.
Chips french fries (proper chips are thick cut, though)
Chip shop (chippy, Scots & Ire: chipper) fish and chip shop
Chinwag to chat
Chucked thrown. Also used with a modifying verb - chucked out, chucked up, etc.
Chuffed proud or pleased
Chunter (alt sp: chunner) to mutter or grumble. to talk continuously.
Cig/ Ciggy cigarette
Class short for classy. Something that's really good.
Coalition government made up of two or more political parties
Cock up error or mistake (from archery terminology, not anatomy)
Coddswallop similar to bollocks but less rude.
Common Land part of a manor over which other people have tradition rights, such as being allowed to graze livestock, cut turf or collect firewood.
Compère master of ceremonies (MC)
Compulsory Purchase power of the government to take private property for public use
Cool box/ Cooler box for keeping food and liquids cool
Cop off with to successfully engage the company of a sexual partner. To have sex with.
Cor exclamation of surprise. (alteration of God)
Costermonger seller of fruit & vegetables
Cotton bud Q-tip
Cotton wool Absorbent cotton, cotton ball
Council house, housing, flat, estate public housing. US equiv = Projects
Cracking Something that's really great
Crack on to get on with something. To flirt with someone.
Crikey exclamation of surprise
Crisps commercially made potato chips.
Cuppa cup of tea
Daft odd, mad, eccentric or crazy, often amusingly so.
Dekko informal to have a look.
Doddle something accomplished easily
Dodgy unreliable or untrustworthy. Sketchy
Dogsbody someone who carries out menial tasks on another's behalf. a grunt.
Dole welfare, unemployment benefits.
Dosh money
Doss to be lazy. Scot: so easy as to encourage laziness "that lesson was doss"
Dossing off to truant
Double parked to have two drinks in your hand (or on the table) at once.
Draper a dealer in drapery (clothes, textiles, etc)
Draughts checkers
Drawing pin thumb tack
Dress circle seats in the first balcony of a theatre.
Duck term of endearment, typically used by adults toward children
Dustbin rubbish bin, especially one left out for cleanup (bin = wastepaper basket)
Electric fire/heater space heater
'ello hello with the h dropped
'ey up Northern English. generic greeting.