A dirty bag is marijuana-smoking device - an alternative name for a lung... generally a 2 litre soft drinks bottle with the bottom cut off, and a bread bag sellotaped around the bottom.

Burning the marijuana on a foil gauze on top of the bottle whilst drawing the bag downwards causes smoke to collect in the bottle and bag. You then remove the gauze and suck the contents.

Multiple useage causes a brown residue to collect inside the device - hence 'dirty bag'.

In some semi-rural communities, disparate groups of dope smokers have been known to share a dirty bag, which is stashed in a particular bush or under a bridge for communal usage by whoever is passing by.
"Get us a bottle and a bread bag and some tape and we'll make ourselves a dirty bag"

"Fire up the d-bag mate"

"Did we leave the dirty bag behind that hedge?"
by Loomis McCartney August 20, 2008
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A "dirty bag" technically defines bagged (as opposed to canned) whipped cream. However, the term can also be used to describe a mug of hot chocolate with bagged whipped cream in it.
"Hey, James, can you bring me the dirty bag from the fridge?" -(bagged whipped cream)

"Ben, can you heat up some water and make me a dirty bag with extra chocolate?" -(hot chocolate with whipped cream)

"Hey, Kayla, bring me a dirty bag with extra dirty." -(hot chocolate with extra whipped cream)

"What, you mean the dirty bag?"
by TheDirtyBagga November 30, 2008
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A way to insult someone that they'll be so confused by it they can't possibly have a good comeback.
by Cliffe009 January 3, 2017
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Girl that is not necessarily classically good looking or sexy, but looks like she would be good in bed.
She's not the best looking girl in here, but she certainly looks like a dirty bag of carrots.
by 68guns March 18, 2009
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well, ya see.. you have a bag. a dirty bag that is. and to make that bag dirty, you shit in it. then with your bag full of shit, you put the shit on the girls chest & moterboat it. good luck, have fun, & be safe.
dude! i totally popped a boner when i was givin that girl a dirty bag of tits!
by sarasavvietrisha November 9, 2007
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A male individual was contemplating a wax of his nether regions, and had difficulty deciding whether or not to include his dirty bag of carrots in the treatment. Ultimately, he decided against it.
by MisterLC August 23, 2017
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A variation of the Tea Bag where the man faces away from the woman, putting his asshole directly over her face while dipping his nutsack into and out of her mouth.

She loved the smell of my ass so much that she insisted I give her a Dirty Tea Bag every night before bed.
by Sebastian Cannon May 31, 2008
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