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1.
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
 
2.
To bury ones face into another persons ass and wiggles ones face from side to side. Similar to motor boating.
Omg! He/She has an ass you would love to Botor Moat!
by Glennyboi May 04, 2014