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Anglo-American slang term used to describe the act of mastubation in order to empty one's testicles of a thick, fat, juicy load of baby-batter in order to start a newer batch.
Or, in the case of the film 'There's Something About Mary,' the theory that "cleaning your pipes" will steady your nerves before a date because your body will not think you are trying to have sex because you will have tricked it into thinking you have done already...
"Percy spent two hours cleaning his pipes because he hadn't shot his load for four days."

"Hey Gordon, you should clean your pipes before seeing Jennifer tonight, it'll steady your nerves."
by Stuart Fletcher November 03, 2004
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When you go into the bathroom and you end up taking a shit, pissing, and ending with a good ol' hearty fap.
"What the hell is he doing? He's been in the bathroom for 40 minutes."
"Prolly just cleaning the pipes"
by SantasTwerkshop December 26, 2013
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Tugging your meat until you ejaculate, and then pissing. This supposedly cleans your urethra (hence, Cleaning the Pipes)

It stings, and that's evidence that it's doing what its name says.

It can also be done right before having sexual intercourse, so you don't get a woman pregnant, and you don't have to wear a condom.
John: "Ugh, I really need to clean the pipes"

John is Cleaning the Pipes in Cindy's bathroom so he can smash her, rawdog.
by Der Dietrich June 21, 2012
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