You are riding a chick. Tell her you have AIDS. Hold on for dear life.
"I was doing the mechanical bull, so that explains the bruises."
by Hot Car1 September 14, 2005
As your doing a girl doggy style and right when your about to cum say a different girls name, and hold on and try to keep your dick in her as long as long as possible.
My girlfriend broke up with me after I gave her a Mechanical Bull.
by TheFdupRUSSIAN July 23, 2011
Someone crazy in bed. Ex: Jeff Matthews.
Liz was riding the Mechanical Bull.
by BiteyTheSquirrel April 07, 2008

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