Portmanteau of Sigma Male and Nigga. Often used in the looksmaxxingcommunity for initiating black chudpilled betas into the sigma clan.
Kai Cenat: *dry humps body pillow*
Jarvis: You ain't sigmigga pal
Kai Cenat: runs away and cries
Jarvis: AIN'T NO WAY HE SAID *runs away and cries* OUT LOUD