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1.
Homosexual, gay or Ghey, a person who enjoys the company of the same sex. Can refer to a male or female homosexual.
Twilight fns are a bunch of side by sides.
by Homer Pimpson 69 November 29, 2009
 
2.
Term for a double-barreled shotgun with the barrels placed side by side instead of on top of each other. Typical shotgun for hunting small game.
yo check out this side-by-side!
by Johnny B May 25, 2004
 
3.
taking a dump while someone else is taking a dump in the stall beside you
Chris & Ron joined each other for another side-by-side after lunch.
by Trevor E. Gregory August 11, 2008
 
4.
(n) or (v)The act of two men (gay, bi, straight) laying "side-by-side" and giving each other "hand jobs" and/or masturbating them selves. With three people this could be referred to as "skiing". See other terms such as Ohio State Cheerleader for examples.
"Wow Nate did you hear about Joey and that random doing a 'side-by-side' in Arizona ?" , " I always enjoy a good "side-by-side" at the fiesta bowl. "
by UT4EVA February 19, 2009