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1.
Member of Phi Beta Sigma Fraternity Incorporated. Founded January 9, 1914 on the campus of Howard University in Washington, DC by the most honorable A.Langston Taylor, Charles I.Brown, and Leonard F. Morse. The sum of all and represents true brotherhood, scholarship, and service.
Every man wants to be a SIGMA man.
by Bro. Chapman May 10, 2008
 
2.
A never resting bald headed maverick that keeps coming back when you kill him
"So its you sigma....i knew you'd come back for the 600th time!"
by Uber-Chris May 11, 2003
 
3.
As said above, a bald Maverick that won't fucking die! Except in X8 where he's gone for good. At least so says Capcom. But they lie too much and give me gas.
Sigma: JUSDIEECKS!!!11 JUSDIEEE!!!!111

X: WTF mate?
by AD2101 January 10, 2005
 
4.
a pistol made by smith and wesson just like a glock but less expensive and more reliable
fuck your glock i gotta a sigma
by wardendodger December 22, 2008
 
5.
Orginally an east coast based secret society, it is now rumored to exist all over the country. Selection is deemed to be the most vigorous of all secret membership clubs and are recruitment is based at most of the major top tier universities.

Very well known for sketchy dealings, members of this society are notorious for bending the political climate to their liking.

i wish i was asked to join the sigma s, i hear they have 0% interest loans.
by jake t February 03, 2007
 
6.
An East Coast based Secret Society. Members identities are not revealed and goals of the Sigma S remain unclear. Membership is deemed to be the most selective of all major clubs in the USA. Application is by invite only and selection is rumored to be less that 15%.
I heard the Governor of Virginia is a Sigma S member.
by Martin Heffner October 22, 2006
 
7.
A sigma is a b.i.t.c.h no not a "bitch" but a beautiful intelligent talented cute little human. Anyone would love to be around a sigma! Her charm and optimism is irresistible. Some might even say once you've been around a sigma you can never go back! However if you ever get on the bad side of a sigma, kill yourself before you get some of her attitude.
"That girl is such a sigma, i never want to leave her!"

"Yeah she's a sigma alright, don't get her mad"
by sweetooth345 August 21, 2011