1. A persons bleeding face or head after an ass whipping. 2. Someone who just got the shit beat out of them and has visible damage to the cranial region.
1. Damn, that fool just got his wig split. 2. Shut up or I will split your wig!
To hit someone in the head and hopefully cause injury.
'He had one helluva split wig'
'You gonna get your wig split'