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.
by FreshKicks June 19, 2009
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1. A group, gang, or other collection of males who attempt to round up, lasso, or otherwise capture hot, young, and unblemished females for the purpose of sexual activity.

2. A group, gang, or other collection of males who attempt to round up, lasso, or otherwise capture, hot, young, and unblemished dam-building rodents.
The prettier 8th grade girls were always worried that one of the neighborhood's many beaver posses might catch and fuck them on their way to school.
by The Real Champ March 31, 2007
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Short guys or girls who hang together, thereby making themselves feel collectively bigger and more powerful. Runt posses can make normal-sized people feel freakishly tall.

Warning: Male runt posses can turn into the most obnoxious guys in the room.
Liz: "Look, Jan and Katie just got here? Let's go say hi!"

Gwen: "Naw, girl, they're with Squeaky and Lil' Jeanie. I'll look like Andre the Giant next to them. Total runt posse."

Pat: "Man, did you see that little dude over there just get in my face because I accidentally grazed his left elbow?!"

Pete: "Bro, that's just Timmy Smalls feelin' like a bamf cause he's hanging with his Runt Posse. I'd stay away from him though."
by Hookermom October 6, 2009
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In English common law, the power of a county sheriff to enlist able-bodied citizens of the county to help him in the pursuit and arrest of a felon.
"Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both." (Title 18, Section 1385 of the United States Code)
by flood control dam #3 March 22, 2007
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A medium to large group of sport bikes. similar to a biker gang, but composed of only crotch rockets.
That crotch posse had some nice bikes.

Did you see the size of that crotch posse?
by Neutral_Bomb October 14, 2009
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Younger lads who aren't old enough to party that hang out at O'Charley's to sip on sodas.
The O'Charley's Posse parents will be picking their kids up at 10:30 friday night in the parking lot.
by Hammerithome November 18, 2006
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A group of females that hang around a certain male and are rarely seen out in their full group without the male present. More often than not they are all sleeping with this guy or have slept with him at some point.
Yo get Dave over here tonight and tell him to bring his posse of pussy around too
by Trez_City December 12, 2006
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