Sigmatic
A sigmatic is the type of senile old man who plays FGC games and gets their Twitter @ stolen by dudes named Tom Robinson
Tom Robinson: “Haha beat cha on the name grab. We know who the REAL Sigmatic is here pussy boi. Cry me a river.”
sigmatize
To put something in one's sig.
That was such a good quote, that I just might sigmatize it on Halo 3 Forum.