Being at a certain point of desperation where you'll reach over to another table and help yourself to the unfinished drink of someone who's left the lounge. Common practice of stressed-out folks about to head into a sales call, going through divorce, or just want to put the "seed" in "seedy", and need that extra drink. Usually practiced after one has had a couple of drinks (to, ya know, establish that you "belong" in the establishment), and desperately reaches for some abandoned beverage in a knee-jerk, fuck-all gesture.
"Dude--drinking that beer that guy left is pretty dirtbag."

"You wanna go get drinks later--maybe a bit of dirtbagging?"
by Skip Bloody Rotter June 10, 2009
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Prior to Teabagging, the person performing the teabagging pulls his scrotum between his legs and wipes it across his anus.
Pers1: I'm so gonna teabag Mike!
Pers2: No man, I heard of this thing called dirtbagging on the internet, let me show you how it's done.
by Fineilltrythisone February 3, 2011
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A person who is committed to a given (usually extreme) lifestyle to the point of abandoning employment and other societal norms in order to pursue said lifestyle. Dirtbags can be distinguished from hippies by the fact that dirtbags have a specific reason for their living communaly and generally non-hygenically; dirtbags are seeking to spend all of their moments pursuing their lifestyle
The best examles of dirtbags and dirtbagging are the communities of climbers that can be found in any of the major climbing areas of North America--Squamish, BC; Yosemite, CA; Joshua Tree, CA; etc.
by Shay (dirtbag wannabe) August 18, 2007
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n: Piss-poor, unemployed rock climber who lives off scrounged food and sleeps, obviously, in the dirt. The pinnacle of climbing committment and idol of employed climbers.

v: to 'dirtbag it': the act of living as a dirtbag
n: Climber A: "That ass hole said he climbed 200 days last year - is he full of shit?"
Climber B: "Nah man, he's a dirt bag, fo sho."
A: "Fuck."
B: "Yeah dude, some day..."

v: Climber A: "Sorry to hear you got laid off. You bummed?"

Climber B: "Nah, I'm just gonna dirtbag it in The Valley {Yosemite} all summer and regroup next fall."
by Daybagger May 7, 2009
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An individual who is not capable of respectfully participating in any common aspect of society including/but not limited to: hygiene, intelligence, fitness, appearance, style, speech, sexual relations, means of transportation, housing, and familial obligations. They get their clothes from school lost and founds and go to costco to eat the free samples for dinner. In the eyes of society this person is about as useful as a bag of dirt, they can be used to fill up holes in the ground and thats about it. Nobody wants a dirtbag in their house because they will soil all the carpet and then try to eat the shit out of the catbox.
Dude, get this dirtbag out of my house! He is making the air contaminated.

Dylan: Hey man, can Joey come to the party?
Cameron: No way dude, that kid is a dirtbag. He always shows up smellin' like low tide at the bay, and always tries to steal my clothes and eat my cats shit!!
by c.harris June 2, 2011
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A slang used in the United States Army to describe a soldier whose performance is lacking. Dirtbag is typically used to describe a soldier with long term performance issues, whereas similar US Army slang, such as "Ate up" and "Soup sandwich" are used in the short term. All soldiers have at one time or another been designated as "Ate up" or "Soup Sandwich," but only those with significant long term problems are labelled as being dirtbags.
"Soldier, you were once just ate up, but now you're becoming a real dirt bag. Are you proud?"
by GaliemVae... oh, fuck it December 7, 2004
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A guy who has no standards when it comes to women. He will fuck anything that breathes, and it won't faze him one bit the morning after. He is also an alcoholic,and cigarette/drug addict, or recovering drug addict, who never went to college. Most likely does manual labor work and spends more than he earns. A real filthy, poverty-licking, ugly, just nasty motherfucker.
Hey dirtbag: come here you degenerate waste of breath and change my tires.
by ladies man12433 April 14, 2009
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