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1.
originated by the greatest pitcher of all time, Dylan Vytlacil..its the now you must turn on in order to use your butt in any way.
I have to fart, i must turn my buttknob first
by Sidric The Entertainer February 09, 2005
 
2.
A girl from from the south central valley in California with a perfect booty.
Kristy is a Butt Knob!
by J Solo April 24, 2007