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On the pipe 

Def: act crazy
Origin: smoking crack makes you do crazy things.
Last night, Twanna was acting like she was on the pipe when she saw Jamel at the club getting his freak on with Twila. She was buggin.
On the pipe by Bif December 9, 2004

laying the pipe 

The act of having sex with a female using your massive pipe
dude last night I was completely laying the pipe with sheela
laying the pipe by Emanthe2 March 17, 2016

In the pipe 

Following a relatively safe corridor through enemy anti-aircraft fire. Often used in conjuction with 5 by 5, meaning that the craft in question is either undamaged or has suffered very little damage.
"We're in the pipe, 5 by 5!"
In the pipe by Macavity October 31, 2003

twice on the pipe 

A rejection of a romantic advance; derived from the song "Knock Three Times" by Tony Orlando and Dawn.
"Johnny asked Amanda out last night"
"How'd it go?"
"Twice on the pipe"
twice on the pipe by NA + mum October 16, 2007

paint the pipe 

Ever since Paul's girl dumped him, all he does is paint the pipe.
paint the pipe by Flannelguy June 7, 2009

Pump The Pipe 

to masterbate. pumping the pipe originates from the ancient art of placing a hand over ones shaft and moving the hand in a linear motion making sure to pull back the foreskin exposing the urethra ready for ejaculating the semen.

A popular misconception of this phrase is doing the same hand motion whilst urinating to give the false impression of a constant stream of clear semen but infact its just piss.
"Dude this morning I missed breakfast and was starving in class so I had to run to the toilet and pump the pipe into my mouth"
Pump The Pipe by Munchkin Whore March 18, 2010