Top Definition
Where a man or women puts a mass amount of lube on their fist and the other man or women then proceeds to sit on that fist while it glides gently up their booty.
Curt: My buttholes feeling a little tight right now.

Austin: Well I can fix that right up with a slippery doorknob!
by pattyrick2313 March 17, 2010
A slippery doorknob is the prank, when you put a doorknob up your anus and then you stand back and watch people use it.
Online, I watch videos of people preforming a slippery doorknob, it is funny.
by aylack, south africa August 28, 2006
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