The act of farting and producing a noxious odour, due to needing the bathroom immanently - there is one in your 'pipe'.
Dave let rip and his drinking buddies guffawed and covered their noses.

"One in the pipe, old son?" Inquired Pete with a wink.
by Gary Mabutt June 18, 2008
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Refers to urination or ejaculation, which clears the urethra.
Guy: I just took a one way pipe cleaner to relax a bit.
by finishhim May 3, 2011
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