1. Noun: someone, usually a guy, who uses and abuses a friendship and hospitality and yet somehow, maintains
friend status.
A
youch may crash on your couch, fuck your girlfriend and wear and ruin your clothes, etc.), but you'll still find yourself hanging out as drinking buddies on Friday night.
2. Verb: To be a youch, the act of
youching (see explanation above).
"I don't know how he
can hang out with those guys constantly. They're all a bunch of youches."
"That guy has been
youching him for years and they're still friends. Talk about
enabling."