What is Sig O?
1.
A shortening of 'Significant Other;' particularly useful when addressing a mixed gender group with varied marital statuses. Frequently pluralized: sig o's.
You guys should come over tonight for the bowling tournament, and bring your sig o's.
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1.
When two guys are tag teaming a broad and they high five during it.
That girls a slut we high fived her last night.
See tag team, slut..