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...
Example:
"
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."