layin some pipe 

The moment prior to taking a major dump. Pipers are long pieces of poo that sometimes get to the length of a foot or so.

Dude, I can't hold it much longer, I'm gonna have to lay some pipe.

layin some pipe by bill May 1, 2003

Laying Some Pipe 

When a man is giving it hard to his female lover in any of the multiple sexual positions.

Dude 1: "Hey did you hear I was laying some pipe doggie style with Susie last night?"

Dude 2: "No way I have wanted to hit that for months now."

Laying Some Pipe by Excelsior0509 December 12, 2007