A BX was a mid sized car made by Citroen (France). It was made between 1983 and 1993 when the Xantia replaced it, and it was replaced by the C5 in 2001. The car was styled by Gandini and featured Citroens famous Hydropneumatic suspension, The diesel version was an 80's legend.
A 1987 Citroen BX 16RS Estate in white.
by Andre Citroen March 19, 2005
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Short for Intel's 440BX chipset, which was the last good chipset they made. The 440BX replaced the 440LX, the big difference being that the BX was speced for 100 MHz operation. Though it only supported 2x AGP and IDE speeds faster than UDMA/33, new BX boards were being designed right up until the start of the Willamette.

The 440BX was legendary for being an good chipset to overclock on. Though it officially only supported front side bus speeds up to 100 MHz, it was rock stable at 133, and, with extra cooling, often went to 150. This is one of the very few chipsets that was ever sold overclocked right out of the box. Both the Abit BX-133 RAID and the Asus CUBX series advertised on the package that they supported 133 MHz FSB. The BX was one of the few chipsets that could be counted on to overclock to 133, rather like a Celeron 300 could be counted on to do 450 MHz, or, back in the early days, how a '486-25 could be counted on to do 33 MHz.

The BX was also the last Intel chipset to natively support ISA, which, despite being slow, is to this day fast enough to keep up with things like a 56k modem.
"My Linux box is a Celemine 1 gig on a BX board."
by Deuce on Guard August 17, 2003
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An abbreviated version of Base Exchange, the official department store of the United States Air Force. It is essentially the same as the PX, or Post Exchange, but to reduce the amount of small meaningless disputes between military brats of which is the correct form, all of the locations on Air Force and Army vases are being renamed to just “Exchange”, or The X.
I’m heading over to the bx to pick up some nails.
by Bionodroid July 30, 2019
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A really poorly designed bi-level house usually wired with metal clad cable and walled with plaster.
Yo you heading over to the bx mansion tonight?

Nah yo that place is a real shithole!!
by Bx mansion December 19, 2019
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An arm instruction that branches to LR register, used in ARM32 CPU architectures. Also NOPed by excited noobie "hackers" for abnormal code behavior to occur.
GEAR, GEAR, BX LR!!!!!!!!!! I NOPed a BX LR and the code never stopped running
by busmanl30 October 21, 2020
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A word used to define shemale ranger in the game Runescape.
Bx f00l, stop grabbing my butt! I don't go for other guys!
by Riceboy October 25, 2006
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Blow something completely out of proportion; get loud and obnoxious and sometimes violent over things that aren't that serious
Lillard: I'm not gonna pull a BX on her, I'm just gonna confront her respectfully
Peachy: Omg good, pulling a BX would be crazy
by lvtely March 24, 2023
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