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2.
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
 
1.
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
 
3.
Someone crazy in bed. Ex: Jeff Matthews.
Liz was riding the Mechanical Bull.
by BiteyTheSquirrel April 07, 2008