A sexual act involving the victim's head being pushed inside the hole of a bottlebank, so it can't be removed. It can be homosexual or heterosexual, but is usually in the form of gay/gang rape. The most common bottlebanking zones are those with the most bottlebanks e.g. car parks, supermarkets etc.
'Have you heard about that Johnson kid down the street?'
'He got bottlebanked last Wednesday down by Tesco's!'
'You serious? Damn...there's a big bottlebanking scene around here'