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1.
The last name given to someone of utter disappointment.
Dude, you might wanna go down to the court house and change your last name to Whitmore after that one.
by Gay Joe W. January 22, 2012
 
2.
The act of having sex with two hot chicks at once.
Those hot chicks other there was down for a whitmore last night.
by #1 Homies June 18, 2009
 
3.
n. - The act of having sex with a four-legged beast, dog
During Business Law, Stahl complained about being tired and Korey, not being one to allow that comment to go through, claimed it was due to a Whitmore last night, which was recieved with raucous laughter.
by Sunday Sarge June 16, 2008