Any person that is being annoying.
Yo, coopert, get your shit off my bed.
a person that provokes you to call the cops on account of raging fagityness and not in a good f3 way in a way that they actually think their faggyness is cool and not faggy; usually possessing a pale, hairy ass and/or saggy boobs; often lesbian; must have tendency to finger themselves into the dark of the night
(whoever wrote the other definition is a coopert)
Jaime, your coopertness is off the chains
Kessleclit, stop humping Jaime, you will produce coopert offspring
Jaime, you coopert, get your hands off your dick.