1. To succumb to extreme or irrational emotion, such as anger, anxiety, fear, bewilderment, etc. Now, don't wig out, but I had a bit of an accident while driving your car. Everyone started wigging out when the government announced food and water shortages.

2. To cause someone to experience an extreme or irrational emotion, especially anger, anxiety, fear, bewilderment, etc. In this usage, a noun or pronoun can be used between "wig" and "out." These collections of horror stories really wigged me out as a kid. Nothing wigs out my parents like missing my curfew without telling them where I am.