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.
by AirbornePathogen July 30, 2011

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.
by sexy SIG initiator April 30, 2010

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.
Dude, I gotta quit hollerin at these SIGs; They're all crazy.
by kodaman August 05, 2009

i' AM sig
by sig'n it June 30, 2009

by Ti'Brus April 18, 2008

by Someone...Someone. December 18, 2010
