To get totally fucked up while doing something stupid. Generally performed while in the company of friends and/or alcohol.
"Dude, Aaron did a keg stand last night and got completly Yauched. Now he has no teeth."
by You Suck and Have No Friends July 18, 2008
Midwestern slang for a cephalopod-like creature.
Did you see that yauch spray ink all over that predator's face?
by Pee Jay November 18, 2007