An '80s term used when a friend or parent over reacts.
1.
BFF-"Oh my God, my prom dress isn't ready"
ME--"
Gee, no need to
Wig Out!
2.Me-- "You should start the car, we REALLY need to get going."
BF--"Why?"
Me---"My mom is totally going to Wig Out if I'm late for curfew!"