A variation on the slang "roflcopter". Doesn't really mean anything, and its humor comes from using it in the most obscure of places.
Person 1: What kind of car do you drive?
Person 2: A rafflecapter.
Person 1: Ugh.. I can't ever get a straight answer from you.
Person 2: A rafflecapter.
Person 1: Ugh.. I can't ever get a straight answer from you.
by PandaBlue September 12, 2007