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The act of passing out on the toilet while taking a shit when you're drunk and leaving the door open so everyone can see your small hairy wiener.
Kaitlyn: I have to go pee really bad!

Adam: Well that's too bad. Garrett's pulling a Dirty Gary in the washroom and I don't think you wanna go in there. Go pop a squat on the stairs.
by Xulander November 10, 2009
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The act of masturbating to porn and ejaculating into a piece of toilet paper, later, putting that piece of toilet paper in the toilet and forgetting to flush the toilet. Later your mother gets home and believes it is mucus and makes you stay home sick.
"Dude are you coming snowboarding with me tomorrow?"

"No, I can't I just pulled a Dirty Gary and my mom thinks im really sick"
by PACO-PACO March 26, 2010
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The act of getting head from a girl while she is in doggie style position and then you reach around and stick your finger in her butthole.
I was laying on my bed while my girlfriend was giving me head in doggie style position, when I licked the tip of my finger and reached around and stuck my finger in her butthole, I smiled the whole time as I gave her a dirty gary.
by TLA100 October 06, 2011
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The act of ejaculating while not even touching your own small cock while holding, cleaning, or otherwise maintaining with both of your hands the dick of a well hung stud while he is fucking your wife/girlfriend or after he just fucked your wife/girlfriend.
Last night in the cabin, I was taping Jeff fucking Tara and Bill fucking Sarah. While in missionary position, neither could simultaneously hold their weight off them plus unload on their stomachs. Surprisingly, their husbands who had been watching from the sidelines sprung into action and a double Dirty Gary ensued.
by SPWD July 10, 2008
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