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1 definition by virginiasucks

 
1.
When you or someone is so tired you keep falling asleep over and over causing a "bobbing" effect with your head (with your mouth open). This occurs mostly in the sitting position, and resembles the motions of giving a blowjob.
I was so fucking tired today, I was cock bobbing all through class.
by virginiasucks January 25, 2012
4 0