what the sigma Share definition Flag its a saying. basically its how you say what the fuck or what the hell but in a more brainrot way. "yo bro, i lowkey like my cosuin ngl she lowk hot" "erm what the sigma" what the sigma by bruhwhattheflip June 1, 2024 0 0 Get merch Get the what the sigma mug. Buy Now — $32.95 See more merch