Top definition
When preparing for anal sex, the performing partner will begin with the insertion of the pinky finger into the anus, gradually changing fingers and increasing size at the same time.
"I want to be there when he is done banging her to give him a drunken high five."
"Be careful man, he might have shit on his hands!!"
"How so?"
"I hear he is a fan of Ring Sizing"
by B7 Ryan December 20, 2008
Get the mug
Get a Ring Sizing mug for your brother-in-law Bob.