15
When a guy takes and puts on a strap on above his penis, then has sex with a woman. A threesome with only two people.
ex) Brent tried to double down but Alex just couldn't get her leg high enough to do it
by Thomas sa April 17, 2011
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16
To deuce. To take a poo. As in number 2.
I need to double down so stay away for at least 15-20.
by Kris C. January 25, 2005
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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17
n. "Double Down"

1) of or relating to the KFC "double down"; a fast-food miracle in which the bacon and cheese are contained in two chicken patties; a cardiac death-wish

2) slang. The act of two men face-to-face holding their dicks together in one or two hands, lubricant and/or thrusting optional.
"We're both tops."
"Oh, so how do you.. you know...?"
"We mostly do oral and Double Down together."
by somethinginsodomy June 23, 2014
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Dirty Sanchez Plush

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18
-verb; a series of actions in which a male or female (generally a male), when confronted with the sibling of a former sexual partner, proceeds to engage said sibling in sexual relations, thus "doubling down"
-noun; a reference to the afore-mentioned aspect of copulating with one sibling and then the other at a later date, spoken of as though it were a status, achievement, or standard to be gained
(verb) "When Shawna's sister Latrice started dry-humping me at the costume party, I realized I had the chance to double down without either one of them figuring it out."

(noun) "One of my lifetime goals is to achieve a Double Down with identical twin blondes, giving one a Tony Danza and the other a Bareback Surprise. All together, I will have achieved the trifecta of sex maneuvers, thus sealing my name among the gods forever."
by Dave the Knave April 28, 2013
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Golden Shower Plush

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19
Double down describes how down a person is to do something. You're not just 'down' , you're so down, that you're double down.
Yo Dylan, you down to go to 7-11?
Yeah yo I'm double down.
by Alcazar805 August 08, 2014
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