Minger = Blimey look at that ugly bitch
Kagmag = Bad meat
Codswallop, tripe, piffle, crap, bollocks as in f****** bollocks = Your talking daft, though of course the first three are more polite ways of saying so.
Balmpot = Village idiot, also used as sense of endearment, from the county of Derbyshire.
Boy = Mate
Cut her adrift = Get rid of the slag
Slag = Female who sleeps around
deleted
Twat = Idiot
Give im some slack = Give him/her room to have their say
Bent as a ten bob note = Poofter
Howler = good joke or someone lying
theres hundreds, if not tens of thousands more, but right now I'm too busy to write any further.