1)
Known commonly to United States Military as the Blank Fire Adapter. This barrel cover is screwed down to prevent blank cartridge from becoming dangerous.

2)
A term adorned by under paid and over worked soliders meaning Butt F#@k Adapter. Used to express frustration of deadly units limited by an ugly orange box at the end of the rifle
GI Joe: Hey Rambo, are you stoked these ugly orange boxes will be defilling our instruments of death? Get ready for 3 hours of team tactics with our BFAs!

Rambo: OHN (o hell no) Joe! This lousy contraption is more like a butt f*#1 adapter!
by takali10 December 8, 2010
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Begging For Anal.

only females can be BFA
Liam: dude, I was with this chick last night..she was BFA!
Ash: yeah she was!!!
by Big yeti dawg! May 25, 2012
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Abbreviation for the words Blast From the Ass. BFA is the act of having an absolutely terrible diarrhea attack that exploads from your buttocks as you sit down to the toilet seat. A polite code name to use instead of saying, "Oh, no! I have to take a shit!" You can use the term so others in your group/significant others know there is an emergency without notifying strangers.
You're in a club surrounded by hot people who you don't want to know that you need to take a massive shit. "Oh, man! BFA on board!"
by Jesse Gonzalez February 1, 2008
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Wow! He's hot. (Then he walks closer.) Ewe! BFA!
by doubleusf August 23, 2009
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"Damn that is one BFA"
"Yea he's in the gym every day"
by Smittay PharmD October 22, 2008
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Hey Jody, can I get some BFA on what to do about Kelly?
by Brian Dogood March 5, 2008
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A BFA (BEST FRIEND ALWAYZ) A FEMALE THAT WILL BE THERE FOR YOU WHEN YOUR BEST FUCKING FRIEND FOREVER CHEATS ON YOU WITH A TYPE OF CEREAL BECAUSE SHE THOUGHT U WHERE CHEATN ON HER WITHA TYPE OF FOOD!!!!
SO U FEEL ME AS MY BEST FUCKING FREND FOREVER WAS WITH SOME CEREAL CALLED TRIX I MET ME A BFA DAT LOVES TO GRUB!
by big pimpen ass macdaddy daniel November 4, 2009
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