An expression used before or after one takes a piss, meaning that if it takes more than three shakes to get rid of the excess pee it can be considered masturbation.
Tom: Man, I sure have to take a piss
Larry: Well be quick about it, if you shake it more than three times you’re playing with it!
Larry: Well be quick about it, if you shake it more than three times you’re playing with it!
by Cornyhotdogs November 7, 2017
Get the If you shake it more than three times you’re playing with it mug.