A clothing company. They make military-issue clothes of different kinds, for civilians.
"I have a BDU and boonie that were made by Propper."
-me
by Dave September 16, 2004
When something is legitimate and in working order ..

To complete a task with excellence.
numero1: yeah boy! wuz poppin? i got some brand spanking Nike air Max for ya!!

nemero2: they look siq blad? they propper-dopper?

nemero1: Of course b! they as legit as the panties i bought your girlfroend last week fool!

nemero2: you getting knocked out now nigga!
by dchohan August 6, 2008
when you buy weed, and it's ten times better than any weed your friends have. thats propper dankage
"i hate it when i get stiffed with this shit!"
"thats why i went thru nick, hes got the propper dankage."
by n the dark March 6, 2010
bob. "i had sex with the secutary and the wife busted me."

jim. "oh shit your propper fucked"

by Tankengien April 23, 2009
a better way of saying yeah man, thats really cool...
"hey i just got a shed load of money" "PROPPER NIICE!!"
by danlad August 16, 2006