Top Definition
To Motorboat the butt-cheeks, not the breasts.
That girl has such a fat ass, I just want to Motorbutt her!
by Zach and Claire February 24, 2008
Kids with motors in their butts that have endless energy and never stop moving, running their parents ragged.
Where is Gleb? He is motorbutting around the flat. The kid never stops!
by papa_john February 19, 2011
From Babylon 5: a butt that farts with rapid frequency
Motorbutt? I don't like the sound of that.
by BigMac1999 January 21, 2008

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