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.
by Ronald Jeremy Hyatt December 20, 2009
To bury ones face into another persons ass and wiggles ones face from side to side. Similar to motor boating.
by Glennyboi May 04, 2014