Conjunction of 'boy' or 'butthole', and 'pussy' to refer to the anus. Originally used exclusively to refer to gay male's anuses, it has slowly entered the general lexicon to playfully refer to any sex's anus.
"Bummy wet" is used by a guy to tease a girl about her high level of sexual arousal, implying in a joking way that she's so wet she's practically a "bum," or someone who can't control their excitement.
The word Gitcoon is a phrase tossed around between citizens of Adlington, and not many know what it means, but between the aggiers its a word to show your a full on twat. Git-Coon.
Bob: Fuck me whats up with all these wankers at this party?!
Joe: Innit, too many Gitcoons
Bob: You hit the nail on the head then pal.