When a man wears tight jeans and therefore must move his penis to the side creating a "side pipe"
Man 1" These jeans are so tight"
Man 2 "I know you sure are rocking a side pipe"
by alycatC November 25, 2011
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The act of copulating the stomatic abdominal opening of a colostomy patient.
Pete - "Bro, I heard you were trying to bang Stacy. You know she has a colostomy bag right?"

Travis - "I gives no fucks. Im'ma side pipe that slut."
by swimp March 9, 2015
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When an individual of the male persuasion in an institutional circumstance (i.e. work, school, etc.) becomes sexually aroused, due to thoughts of past sexual exploits; the subsequent tightening of the groin area, due to the constriction of pants upon the hardened member, produces a penile-angular shift, which is almost perfectly horizontal in form, and points towards either the left or right. Thus the moniker, Side-Pipe.
Mosieur LePajonais: What, pray tell, is that tubular formation protruding from the side of your pantaloons?

Herr Schmidt: Why, my good man, tis my side-pipe!
by ZIJPIJP June 16, 2010
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When a male has an erection that is bulging down his pant leg on his thigh.
Look at Jimmy's side pipes!!!
by rjvir2 November 29, 2004
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what becomes of a peenee in pants that are too tight.
cederic: jeez omar, your side piping is ridiculous.

omar: um, cedric, i know you've eaten a lot of shrooms but you're package isn't looking so discreet these days either.
by 9irl April 20, 2006
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When one man stelthely approaches another man from the side and rubs his man parts against another man's side. The man then shouts"Side Pipe". This activity typicaly takes place on Saturdays to celebrate "Side Pipe Saturday" .

Background: These types of games evolved from "Man Love Monday" where heterosexual men isolated from women while working in the logging camps of North Central West Virginia playfully turned to one and other to cope with isolation and lonleiness.
While Standing in the lunch line Rich snuck up on Mike and side piped him.
by Floyd Waterdriver August 20, 2011
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Side Piping (Side-Pipe-Ing) - is:

1. When a man or a chick with a strap-on is fucking a man or tranny in the ass from behind (doggy style).

2. The person in the aft position grabs the other persons dick, pulls it back to where it is between the legs of the two people fucking.

3. Starts to jerk it off in the open space available. Being that the only available space in this fucking condition is to either side it is called Side Piping.
Dude - I was Side Piping that Thai tranny hooker while I was nailing her ass and that bitch blew a load on the coffee table and now we got jizz on the TV remote.

Tranny to tranny friends - That dude bent my dick around behind my leg and jerked it off while he nailed my ass. He made me cum but I think we should charge extra for Side Piping!
by Side Pipes October 6, 2011
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