When you buy lunch for a girl without realising its actually her round, then whilst innocently walking back to your office you realise that in fact it was her round and you have been financially bum raped.
Bloke #1 - "Hey, r u's cumin to Bum Rape Fields to nyt!"
Bloke #2 - "Fuck no! I don't want to get buggered up the ass hole"
Bloke #1 - "Bloody well right, then!"