Some Collars have a plastic piece in it. If your lucky during sex your Collar just might POP!!!!!!!!!!!!!!!
About 2 months ago I was fucking this hot little blue eyed black haired broad and MY COLLAR POPPED!!!!!!

POPped CollAR
by MyCollarPopped March 27, 2007
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People who wear green collared shirts, with the collar popped, are looking for a sex partner.
Diane: Hey, Jim is wearing a green shirt with a popped collar... I'll invite him over!
by Sid July 2, 2005
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