Top Definition

to put your face between a womans boobies and shake it back an forth making sounds that an engine would normally make

used for texting and/or computer messaging
Dude, you won't go ( o ):-D( o ) her massive titties.

You are one motorboatin son of a bitch.
#boobies #titties #motorboat #awesome #cool
by Timtoe July 10, 2008
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