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 best friend for life. A girl or guy, whom one is best friends with. Someone who you can trust and whom you love a lot, but as a friend. And only a friend.
This is my biffle Chelsea, we do everything together and have a lot in common. I love my biffle, she is my best friend for life. I would never want to lose my biffle,she is an amazing friend.
by Christiana Carrico November 27, 2007
Get the bifflemug. Pronunciation: \'bih-full\
Function: noun
Etymology: from the internet slang term bffl (best friends for life)
Function: noun
Etymology: from the internet slang term bffl (best friends for life)
by dilleh December 15, 2007
Get the bifflemug. 
a person's best friend
by Christine February 8, 2005
Get the Bifflemug. by nfast July 13, 2011
Get the Bifflemug.