Shorthand for SIG-Sauer, a German-based manufacturer of some of the finest tactical pistols and rifles on the market. The acronym stands for "Schweizerische Industrie Gesellschaft," German for "Swiss Industrial Company." SIG, a Swiss firm, partnered with JP Sauer & Sohn, a German company, to form SIG-Sauer and broaden the market for their firearms. SIG pistols are used by the US military, the Naval Criminal Investigative Service (NCIS), the US Secret Service, the US Department of Homeland Security, and law enforcement all over the US. SIG pistols are available in several different configurations and several popular chamberings, including 9mm, .45 ACP, .40 S&W, .357 SIG, and .380 ACP. SIG pistols have a well-deserved reputation as being extremely well-made and highly reliable.
Did you see the SIG .40 that cop was packing?
by AirbornePathogen July 30, 2011
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The acronym for "small intimate gathering", something that is not a party but is more than a few friends hanging out. It inevitably gets rowdy.
"So Joe Blow is having a SIG. You get the keg, i'll cover the hard liquor."
by sexy SIG initiator April 30, 2010
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SIG is a Service Industry Girl. This includes bartenders, waitresses, hostesses, etc.
Man, I can't get any sleep because of this SIG I'm dating. She never gets off 'till 2.

Dude, I gotta quit hollerin at these SIGs; They're all crazy.
by kodaman August 5, 2009
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Anything revolving around being homosexual. Anything that is not straight. Something gay. GAY.
i' AM sig
by sig'n it July 1, 2009
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SIG generally means Sex is good.
Telling someone something along the lines of "SIG, Stacey."
by Ti'Brus April 19, 2008
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1) Abbreviation for "signature"
2) Suck It Good (Almost like SMD)
SMD and SIG!
OMG! He did NOT just say that.
by Someone...Someone. December 16, 2010
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