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.
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.