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A combination of collar and poppin'. Refers to the act of popping one's collar. See also collar popper and popped collar.
Those preppie boys are always coppin.
When one uses sarcastic language to insult another person.
Guy#1: Whatch me man, look what I can do!
*FAILS*
Guy#2: Oh ya bud you're f**king great!
Guy#1: Oh man why you gotta always be coppin' me?
coppin' by I AM A FREAKING RETARD January 24, 2016

coppin' a gnarly swell 

Going to workout so hard that you find it necessary to tell everyone that is near you. Commonly spoken with a high degree of excitement and "toolness"
Vinny: "So what are you doing today?"
Six foot tall swell monster: "Im coppin' a gnarly swell bro"

coppin rays 

when you go and get some sun - basically getting a tan
coppin rays by formeldahyde August 8, 2009

Coppin' Deuces 

When someone acts a certain way then turns around and acts the complete oppisite of their previous mannerisms.
"Harry is coppin' deuces to Sherman because he just told me he wanted to kick his ass and now he is being friendly toward him."

Coppin T 

Playing Tetris, specifically via the website Tetris Friends.

Coppin T does not refer to the simple playing of Tetris just to pass the time. The phrase must be used in conjunction with passion and intensity for the game.
Kid, walking into a computer lab: Hey what's up guy?
Awesome Kid: Shut up, we need to concentrate, we're Coppin T!