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BLF is an acronym for Best Lady Friend. A female friend that's on the top of your close-friends list. It is a platonic relationship. Usually guys use this term to describe the relationship he has with the woman he hangs out with all the time, if she is not his girlfriend.
Vince: Yo Dude! You going out with Violet?
Dude: Nah, she's just my BLF.
Vince: O ok, 'cus I always see you guys together so I assumed she's your girlfriend or something.
by awesomagic October 21, 2011
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For people too lazy to write out "Blue Light Filter" in text.
Person 1: "I use f.lux as my BLF."
Person 2: "I just use my own glasses with a clip-on."
by pinjer February 16, 2018
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(n) Acronym for "Banking Lotta Funds"
Coined originally by the best unknown rapper - King Ton - also known as 3 Ton Rey (spell it wit' an "e" not an "a"), it implies that the subject of the name makes a good bit of money.
"Chyeaaahhh, you rockin' with 3 Ton. BLF is the set..." (From song Carolina Crumb Snatcha by King Ton)
by teriyakitoast October 21, 2014
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A phrase that stands for bitches like to fuck. As we all know, it is very true.
Dude, BLF!
by cowboy13 April 07, 2015
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1) An acronym for Blown Load Fruit Salad. A salad consisting of Cantelope, Cool Whip, romaine lettuce and human sperm.

2) Any fruit salad containing human sperm.
"I serve the fruit salad (affectionatly referred to as BLFS, or "Blown Load Fruit Salad") to my roommates and female friends, who have no idea that they are actually eating my blown load."
by ChrisPixel August 02, 2005
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Acronym for "Best Left Forgotten". Usually implies that something is better left in the past, never to be remembered again.
Jony: Hey, whatever happened to the AirPower mat Apple was planning?

Tim: They could never get it to work. So it ended up in Apple's BLF archives.

Jony: BLF?

Tim: Best Left Forgotten. Kinda like the Lisa and hockey puck mouse.
by Casimus Prime May 30, 2019
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