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1. n. (military) acronym for "bad conduct discharge" as defined by the Uniform Code of Military Justice for US military servicemen, also known unofficially as the "Big Chicken Dinner" as slang for the same discharge.

2. n. acronym for "buoyancy control device" used in scuba diving, a vest that can be inflated or deflated while underwater to control a diver's depth.
1. "Corporal Smith bashed Lieutenant Jones in the fucking pie hole right in front of the general. Stupid shitbird is gonna get his BCD for sure."

2. "Shit, my god-damn BCD has a hole in it. If I dive with this POS on, I'll sink right to the bottom."
by Marc February 14, 2004
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Binary coded decimal. A numbering system where each digit is represented with 4 bits.
0 = 0000
1 = 0001
2 = 0010
3 = 0011
9 = 1001
10 = 0001 0000

^You get the idea.
by D1 March 27, 2005
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"Butt Chugging Device"

A device used for the purpose of administering an alcoholic beverage into the anus.

Can refer to a Guinn Box, a bicycle pump, or any other device fitting the above criteria.
Joe: Hey Tim, can I borrow your bicycle pump for a few minutes?
Tim: Sure thing pal! Planning an evening of butt-chugging I see? Have a good time and be safe!
Joe: Thanks guy, I'll have your BCD back in no time.
by Fliff Queen November 26, 2015
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The term originates from the movie Black Hawk Down, where a helicopter drops a Delta Force team to take down enemies. Black Cock Down is when you take down a girl with your cock. You would basically replace "I'd tap that" with "I'd BCD that"
Sean: That girl over there is pretty hot
Derek: I'd BCD that ass
by Sean J. May 04, 2008
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BCD - Blue Creamy Discharge. When a woman gots issues down in the danger zone, a blue creamy discharge can form and start to drip out. Although there is no cure for BCD, it is more closely related to chlymaida, which has a cure through medicine.
JoAnna did't know she had BCD till a guy went south and came up with a hand full of it.
by YaYa at Whizzer May 15, 2009
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B.C.D is an abbreviation for "Black Cock Down".
It originates from the film "Black Hawk Down", where a series of events lead to a helicopter being taken down. B.C.D is a verb that can be used to describe a persons actions, which usually relates to sexual attraction, or just plain attraction. Similar to "Black Hawk Down", the use of the word B.C.D can signify that you want to "take down" the subject that you're talking about.
* girl walks by in hall*
Derek: Would you B.C.D that?!
Sean: Yeeeeee!! I'd B.C.D that, anyday.
by Paula O. Schofield May 13, 2008
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