Shake it three times 

To turn yourself on while your urinating - (for males).

Going for a slash
Make sure you "shake it three times" dude.

Shake it three times by Monkey666 January 26, 2011

If you shake it more than three times you’re playing with it 

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!

If you shake it more than three times you’re playing with it by Cornyhotdogs November 7, 2017