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fcos is short for “of course”, chat-wize.
Q: Have you seen that movie? A: Fcos.
by DJ Timing X November 16, 2004
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FCO.

AKA: Frothy Cold One.

AKA: Beers for the boys on a friday afternoon.
"Who's up for an FCO? Yeah, Chris, I am, chuck us an FCO"
by FrothyMcGee December 08, 2017
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