1) An elite group of trained assasins that take on various missions.
2) An action or set of actions that are performed in a tatctical yet badass fashion which result in a) severe bodily harm, or b) large amount of collateral damage.
Bad Guy 1: Holy shit, is that Unit 13?

Bad Guy 2: Hell yes! We better get the fuck out of here.

Bystander 1: Wow did you see that merc Unit 13 all those tangos?
by warmachine1981 February 23, 2010
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A : When were you born?
B : 13 August
A : Ahh that's gonna be the date you die
by WaWAWorld April 10, 2022
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National wife beater day. Wear a wife beater
person: tmr is national wife beater day!
person 2: really?!
person: It's where you wear a wife beater

Jan 13
by yaywiisports January 13, 2023
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