a def posse is basically a loser word for cool or awesome group of close friends, usually used by losers and wangsters who want to act cool / people making fun of wangsters by acting like one
by red ass baboon June 25, 2006
Shortened form of "definetly possibly". Since anyone that says "definetly possibly" sounds like a complete fool, someone came up with "def poss". Doesn't really save much time in speech, but it does save a person's reputation. The advantage of saying "def poss" as opposed to "possibly" or even "poss" for that matter is the fact that "def poss" implies that is a serious possibility, rather than someone just teasing with a half-hearted "possibly".
John: I just got a new set of kicks
Bill: Those are def poss the coolest things I've ever seen.
John: Wow, what a chill broseph you are for saying def poss.
Bill: Those are def poss the coolest things I've ever seen.
John: Wow, what a chill broseph you are for saying def poss.
by FreshKicks June 19, 2009