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To push a friend in the back when he is not expecting it or is extremely vulnerable, especially when urinating.
Ohh man JonO! You traunched me while I was peeing and now I peed all over myself!
by Patrick Duggan esq. November 14, 2007
A long walk, usually hours in length, with no general outcome. No set destination is decided before the traunch but one may be decided mid-traunch, thus stopping the traunch. Traunches, at one point, usually take people by the local 7-Eleven.
"Yo bro, I'm going for a traunch. "

"Decent. I'm down."
by Mac Daddy L October 13, 2011