When a very attractive girl makes you journey down the left or right side of your pant leg. In other words she causes you to become erect down your pants which can be embarrassing and even painful if wearing tight jeans.
COLIN: OOOOO Im Sidepiping... three o'clock!
JOHN: Oh yah i see her. She's a beut'!
COLIN: Son of a... this hurts.
JOHN: Dude! Your bursting at the seams. shouldn't have worn those tight jeans. Stop shopping at Ed Hardy.
JOHN: Oh yah i see her. She's a beut'!
COLIN: Son of a... this hurts.
JOHN: Dude! Your bursting at the seams. shouldn't have worn those tight jeans. Stop shopping at Ed Hardy.
by You Got REAMed February 15, 2010

to wear dangerously tight pants in the fashion of 80's musicians and/or pro wrasslers; so that the shape of your manly genitalia show proud and true like the god zues descending mount olympus.
these slortchin muffukkka's flock to my sidepipe like the pulsing dispenser of the nectar of the heavens that it is. (haters eat a dick)
by chauncey mc.ballsdeep November 09, 2003

by wennes March 18, 2015

When a male wears pants so tight, the outline of of his genitalia can be seen. Hence, giving the impression that he is rocking a sidepipe.
by brianxymox July 16, 2006

The part of boobs that shows on pictures that are supposed to be sexy, but are really just kinda dumb, when you can see the side of a woman's breasts from behind or an angle that is mostly from the back.
by Honkylips October 02, 2005
