That's urban slang for pimpin', stunnin', or lookin' fly made popular by the rap group 3 six mafia. Or if someone wants their respect or recognition for doing something. Kind of like when the Fonze on 'Happy Days' use to turn his collar up to be cool.
Ever since I was a kid I been poppin' my collar.
To pimp and/or being a player. Showin' off after workin' it.
"Now every since I could remember I been poppin my collar
Every since I could remember I been working this hoes
And they betta put my money in my hand" -- Three 6 Mafia
pimps pop their collars to call their hoes over to get paid.
"ever since i can remember i been poppin my collar" -three 6 mafia
Poppin' My Collar is the best song by Three 6 Mafia, and one of the better rap songs to come out in a while. The remix with Project Pat is the hottest version of the song. If you don't have this song you better go out right now and buy it.
Yo, you gotta listen to Three 6 Mafia's song Poppin' My Collar.
a white person trying to be black will pop his collar
i have been poppin my collar becoues i want to be black.