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2.
To be cock blocked by a girls friend. ie when there is 3 of you out or you cant get them on their own.
Richard was triangled numerous times in the week.
by Gregory Flanagan December 20, 2009
 
1.
To be savgely attacked.To be beaten like a fat perverts meat. i.e. fast and relentlously
Stevey thought he was rollin deep til he got triangled by some big fuck off mandems.
by Checker May 23, 2005
 
3.
The act of jewing a friend out in a trivial way
Chris: Damn Fadi triangled my seat, when I went to the bathroom!
by f2dx August 11, 2011