Double down

[sumon9999]

to engage in risky behavior, especially when one is already in a dangerous situation.
This figurative usage as appearing in the Oxford English Dictionary is a meaningful explanation of “double down” other than the ubiquitous “to double the wager in exchange for only one additional card in Blackjack gambit” in every online dictionary.

[Justin Bieber]

Having sex with more then one person at once, most usually a girl taking on two guys and even more specifically alternating between blowing one and the other.

In blackjack, to double your current bet at your turn, in return for which you get one more card and then no more. In what situations this is allowed and/or advicable varies somewhat depending on the casino, but if no [card counting] is done, its usually a good move on all hands totaling 11 and some totaling 10.

[Mark Zuckerberg]

Oral Sex with a man that involves the full spectrum of male genitalia, including but not limited to the penis, balls, and perineum.

Named for the likeness to the KFC sandwich, i.e. salty, cheese, and all meat.

[Jason Yan]

The act of performing oral sex to both the genitalia (m/f) and anus.

[Rihanna]

n. Double Down

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

slang. The act of two men face-to-face holding their dicks together in one or two hands, lubricant and/or thrusting optional.

[Dave Paprocki]

-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

[Sonia]

A sandwich that a company markets hardcore to get people excited for, but it doesnt live up to the hype.

[Ernesto]

in the card game of blackjack , to double a bet (= amount of money risked) after seeing your first two cards, in exchange for only one more card

[Ernesto]

A double down is a kind of [cradle] in cheerleading. When popping (coming out of a stunt) from [the stunt] the [flyer] (person up in the air) spins twice.

[Tina]

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.

[Tariq Zaki]

Originally a term used in [the card game] blackjack, where a player doubles their original bet in exchange for exactly one additional card; most useful when the remaining deck is offering extremely favorable odds of making a total of [twenty-one].
The term is increasingly used as a media euphemism when political figures tell bald-faced lies and when confronted with contradictory statements, the politician not only fails to retract their claims but instead expresses an increased certainty in [their truth].

[Tracie Lynn]

After a hard session of [pumping iron], you come home and ejaculate into a cup. You then combine [protein powder] with the semen in the cup to create an extra potent [protein shake]. This process has the added benefits of raising ones testosterone levels (by climaxing), and making you feel as though you are saving the world through recycling.