Double Dunking is the act of taking a shit while sitting upon another person's lap who in turn is also taking a shit. While on the toilet, there is ample room in front of the person on the bottom. This extra space can be utilized by a second person in order to increase defecating efficiency.

Variations of the double dunk include the "French Double Dunk", where the top person faces the bottom person; and the "Roody Woo", which due to its perverted misshapen entanglement of a position is very rarely performed.
Hey man all the stalls are taken, let's double dunk this bitch.
by John Price April 10, 2008
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When one person sits on the toilet to shit and another person sits on their lap to shit. The top person must do their best to aim for the small space available that people normally just use to look down at their nuts and watch their shit float around.
This conserves both time and water and can be two dudes, chicks or co-ed.
Dude 1: "Wow, I have to leave in 5 minutes and gotta shit so bad.... this is going to be a fast one!"
Dude 2: "Dude, I have to leave in 3 minutes and have to shit too! Let me go first!"
Dude 1: "No way! I need more than 2 minutes!"
Dude 2: "Well, looks like we're going to have to double dunk again...."

OR

Dude 1: "Man, last night I was double dunking with my girlfriends, you know, because our water bill is so high, and since I was on top she went ahead and gave me the reach around........ it. was. AWESOME!"
by drgstrSMB April 11, 2008
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When you and your homie shit in the same toilet simultaneously.
Mick and I both had to shit after eating Mexican food but there was only one toilet open so we had to double dunk it.
by Dreamscape009 August 10, 2021
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This is a sex act performed by two people in a pool, this act is where one person will go under water to eat out the other persons ass until that person cums when the person cums the people will switch places and will do the act again once finished the couple will masturbate to Ali-A and Keemstar.
Dakoda: hey I double dunked Adam last night
Shrek: did you record it?
by Hen_tie July 25, 2018
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The act of double penetrating a woman by yourself by swapping holes after each thrust. Requires great skill and speed and gives the impression of DP.
"Whoah dude! Did you hear Ben jefferies double dunked nikki the last night?"

"No way! She's always loved a bit of Double-Dunking. No wonder she can't sit down today!!"
by Proteinmonster October 13, 2011
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A sexual act where one person deficates into another person's anus, then the reciever then deficates into the original peron's mouth and then eats it.
by Billy March 8, 2005
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When a man spins a basketball on his penis and then the woman takes the basketball off the mans penis using only her tongue keeping it spinning. she then proceeds to have intercourse with the man until he ejaculates and she is launched into the air and does a 180 slam dunk. this move must be done in a gymnasium.
Yo man this weekend im totally gonna reverse double dunk attack brenda
by JohnShan March 10, 2008
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