To turn yourself on while your urinating - (for males).
Going for a slash
Make sure you "shake it three times" dude.
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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!
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