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1. A hood or collar made from chainmail. Worn by the knights of old.

2. A substitute cuss word.
What the coif, dude!?
coif by nerd@geek January 24, 2011
Related Words
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
coif by OSOK November 13, 2011
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!!!!
COIF by oican February 3, 2017

Coitus Coif 

The hairstyle ( coiffure ) you wear after getting a proper and vigorous fucking.
Niiice coitus coif, Dude... she must've been on top this time?
Coitus Coif by Scrappy SamCat January 28, 2009

Columbus Coif 

A sexual act in which a person defecates upon another person's head. This could be achieved while a man is receiving fellatio in a 69 position and defecates upon his partner's head.

This is In the same vein as the Cleveland Steamer or the Cincinnati Bowtie} and part of the Ohio Trifecta.
Hey man, me and my chick just completed the Ohio Trifecta when she let me give her a Columbus Coif.

mail coif 

A USPS-delivered hair-styling kit with instructions on how to make an idiot of yourself with an outlandish hairdo.
Mail coifs are a real rip-off --- you would do better just shaving yourself bald.
mail coif by QuacksO February 25, 2019