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.
Oh my god, Spa has just financially bumraped me out of a lunch da fuck.
Sneakily exposing ones rear while in a public place, especially in a crowded nightclubsituation. This should be accomplished without being thrown out or arrested.