1
general::
Phrase(s): wig out
Sl. to become intoxicated. • One more drink and Wally will wig out. • This guy has wigged out. Get him out of here.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Become or make wildly excited or irrational, as in He'll wig out when he gets the bill for that party. This idiom probably alludes to the earlier flip one's wig (see under FLIP ONE'S LID). [Slang; c. 1950] Also see FREAK OUT, def. 2.
American Heritage Idioms