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Stands for Com' On, It's Friday
i.e.

Guy#1: Hey bro can you please finish this report before you go?
Guy#2: COIF!!!!
by oican February 03, 2017
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3
1. A hood or collar made from chainmail. Worn by the knights of old.

2. A substitute cuss word.
What the coif, dude!?
by nerd@geek January 23, 2011
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4
As a cycling term, to be stopped abruptly atop a hill by a slower rider, resulting in a crash due to a loss of momentum.
Fuck!!! Enoel coifed me!!!! - Laks
by OSOK June 01, 2011
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