What a douchnozzle calls a bmw automobile. Douchenozzles who drive "bimmers" will make sure that the unwashed masses do not call them "beemer"; to do so is apparently a grave offense against car enthusiasts everywhere, as a beemer is a BMW motorcycle.
Person 1: Nice beemer!
Person 2: It's a bimmer, idiot.
Person 1: *Punch* Who cares, you condescending bucket of douche? Get over it. BEEEMER!!!!