When you pop your collar, you reach up to the shoulder of the correspoding arm or across the chest to the opposite shoulder, and, using your index finger and your thumb, you pull up on the shirt and let it "pop" down, hence the phrase. It is perfectly acceptable to pop your collar whenever you have accomplished a great, admirable feat, such as busting a sweet dance move, pwning the entire opposing team by yourself, or to establish your extremely high playa factor.
Derek, obviously outmatched, kills all 4 of his enemies alone. Derek pops collar, and TJ holla's "Thats right, pop your collar home boy!"
by Big Playa D Rock March 16, 2006
To flip your collar up on your polo shirt. Very common practice for guys in fraternities and other college-age preppy types. The guy who does this is often referred to as "that guy."
Ronald could never convince anyone that he really popped his collar for practical neck insulation and was not in fact "that guy."
by Nick D January 25, 2005
popping your collar is a gesture meaning that you a pimp, E-40 started popin his collar first. you do this when your dancing, takin a picture or whenever you feelin fly. you could also cogratulate a playa by poppin his collar, like when he's dancin with 2 dimez.
your walking by a homie at the club and you see him dancin with a tight breezy, so you pop his collar thus congratulatin a playa for his skills. you could also say "pop your collar, mayne" while poppin his collar.
by bigbadnorteno415 August 11, 2006