one's BFFL, or Best Friend For Life. it is supposed to be the opposite sex, whom one is JUST friends with, and wouldn't ever date. however many biffles become boyfriends, which really defeats the purpose. unlike best friends, you can only have ONE biffle.
"I heard you and Johnny have been hanging out a lot, are you dating?"
"No way, he's my biffle, duh."
"No way, he's my biffle, duh."
by Britney Kay October 1, 2005
Get the Bifflemug. Usually a great friend of the opposite sex who you can trust with your life. However, someone who is a biffle is not necessarily stuck in the "friend zone", as biffles often make the best couples. Often, a girl may instigate a biffle relationship as a way of flirting. It is customary to be protective and loyal to your Biffle.
"So is Johnny just your biffle?"
"Yeah, he's just my biffle.. for now..."
"Hey Danny, would you like to be my biffle?"
"Yeah, he's just my biffle.. for now..."
"Hey Danny, would you like to be my biffle?"
by KatFish21 August 30, 2012
Get the Bifflemug. to accidentally become intoxicated on account of not eating a sufficient amount of food before drinking
by Pooches R. Turlington September 9, 2010
Get the biffledmug. 
a person's best friend
by Christine February 8, 2005
Get the Bifflemug. by nfast July 13, 2011
Get the Bifflemug. by USJud March 19, 2007
Get the BIFFLmug.