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It's and acronym for Security Commission. It's the ultimate police of discord. They are so deadly that if a guy who knows a guy that then said something to an unrelated guy that was bad about SECO that they find out about this.
Guy 1 "SECO is gonna beat my ass because I know a guy who knew a guy."
SECO by Epic989 March 3, 2019
Graffiti Mongul located in suburbia mid new york Newburgh and Poughkeepsie. Mostly known for his tough freestyle flows and impulse bombing. Keeping the region on lock. Most Cant Compete. Nyg HD Mgc
Girl1: have you seen Seco Dun Dodda new shit i heard hes hot?

Girl2: Yeah...id hit it.
Seco by Gx450 June 11, 2011
A discriptive word of someone who is poggers champion.
Yo, that male over there is cool, you could call him seco
Seco by secoispoggers March 9, 2021
Girl1: How was last night with your lover boy?

Girl2:Ugh!! He was so seco!

Girl1:Damn, that sucks, don't expect to have any kids!
Seco by LitaCub March 30, 2009

Seco Bad 

ME : hEY, sECO bAD
Seco: No
Seco Bad by Seco Bad February 5, 2021

Seco City.

Person 1: Hey female, are you broke?
Person 2: Yes, I am Seco City.
Seco City. by TheZestyGave January 2, 2025