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Modern slang which means that a person is cool/has aura (is cool)
My guy is so sigma
Sigma by PuhuhUHHHH February 16, 2026
Sigma
Sigma by AndersonBaird67 March 13, 2026

“Sigma” 

A “sigma” person is a person who is usually racist, misogynistic and can’t stand the lgbt or furry community, usually by making fun and or generally bullying a member of a certain community, and then having others justify their actions by calling them a “sigma”, not to be confused with actual sigma individuals that actually have respect for peoples feelings.

(Not a rant post)
Person 1: “go kys furry, you probably touch animals

Person 2: “bro you are so “sigma” !”
“Sigma” by Potatoboye June 6, 2023

Sigma Hater 

One who possesses a disproportionate disdain for single bonds. Known colloquially as "pi snobs," these individuals are predisposed to looking down on saturated molecules.
Freddy said he wouldn't go near that 3-methyl octane, but he can't keep his hands off my heptadiene. Man what a sigma hater!
Sigma Hater by Big Diggity January 6, 2015

sigma male 

A more internally-focused sibling to the alpha male. While the alpha male quantifies himself on his high position in the social hierarchy, a sigma male prefers to forego the social hierarchy and need for external validation altogether and pursue internal strength instead. Essentially a "loner" or a stray man, although sigma males may have a close circle of friends and loved ones with whom they share a deep connection. The sigma male is not socially inept but simply socially disinterested. Prefers solitary activities where he doesn't have to play social politics and can simply focus on himself. The sigma male accepts that he does not need power over others as the alpha male desires, but rather needs only power to control himself and preserve his own autonomy from others. Sigma males are often pragmatic but may be seen by others as aloof, paranoid, secretive or selfish.

Not to be confused with simply being an unlikeable asshole, edgelord, or misfit.
John: Hey, who's that over there on a table by himself?
Mary: Oh, that's Patrick. He's a bit of a sigma male.
sigma male by UDUser4820 January 11, 2022
sigma is the most beautiful thing on earth, along with being super fine he is friends with the most hottest bsd characters ever
Person 1: hey did you see sigma bsd yet

Person 2: YESS I WISH HE WOULD JUST SHUT UP AND MARRY ME 😩
person 1: what about chuuya ?….
Sigma bsd by quietk4e February 15, 2022