A simpleton, dunce or idiot. Sometimes used in London.
"Eric's just fallen down the stairs... what a plumb!"
by el tony July 26, 2006
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To have casual sex with a girl.

derrived from how many pornos involve plumbers.
See that hot girl? I'd totally plumb that.
by rsktod January 8, 2005
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The act of purposefully stopping up your toilet so that the plumber will come to your house and unclog it.
That weirdo gets off on plumbing.
by superchar September 25, 2008
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to shove your tool into a girls dirty snatch
by dufa January 11, 2007
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(verb) Very deep anal penetration
Deep-sea plumbing: Anal penetration over 10 inches
"That horse was plumbing that girl yesterday"
by Stan Albright May 17, 2007
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Plumbing is a sexual act involving a man and a female. The aforementioned male pops his penis in the girl's vagina, lubricating her ring, tickling and widening the said orifice. When that there hole is at maximum size, the man pops the scrotum and both balls in that bottomless pit of love.
That girl last night was a bucket, I was plumbing her without even realising. It was mint.
by googabooga April 29, 2009
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Bhe act of saving a life when a person is drowning or choking by repetitively thrusting one's penis in and out of the person's throat. The thrusting creates a plumbing effect that forces the obstruction to move up the throat. This action is in no way sexual; it should only be used during times of grave danger.
Dude! Ellen was drowning at the pool today! Luckily, the lifeguard pulled her out of the water and started plumbing her until she coughed up the water.
by 6HyungPaq9 June 3, 2010
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