To do something crazy,unordinary or weird.
Also it can mean just being unfair,being mad, and Acting like you dont hava any Da** Sense
Yo them nigga'z was laughing at a spot, dem nigga'z wildin
Ayo why you start wildin, chill out its just a little kid
Fu** Dem dudes yo, them nigga's tryed to bag on me and started wildin'