A "reverse motorboat". Achieved by burying one's face between a supple set of buttcheeks and rapidly shaking the head from side to side. Optionally, one may purse the lips and blow out while botormoating to emulate the sound made by a motorboat's engine.
Johnny's girlfriend didn't have much of a chest, so he flipped her over and botormoated her.
by Ronald Jeremy Hyatt December 20, 2009