a sister who is also a best friend, or a friend who is closer to you than a friend and is more like a sister.
My sister, Kim, is also my best friend; she is my sister-biffle!
I love my friend Kristin so much, we are such good friends that she is more like a sister to me; she is my sister-biffle!
I love my friend Kristin so much, we are such good friends that she is more like a sister to me; she is my sister-biffle!
by BAD1484 May 13, 2010
 Get the sister-bifflemug.
Get the sister-bifflemug. by emilydawsonx June 21, 2011
 Get the Biffle Bangingmug.
Get the Biffle Bangingmug. Best friends for life forever, when "best friends for life" and "best friends forever" are not enough
"We're not just friends, we're not just best friends, we're not just biffles, we're BIFFLES FORIFFLES."
by Mr. La-Liffle June 25, 2009
 Get the Biffles Forifflesmug.
Get the Biffles Forifflesmug. A girl that has a big booty along with a cute face and rocking body that can show you the time of your life anywhere and anyway she wants to.
by jay em ay January 1, 2009
 Get the Peruan Bifflemug.
Get the Peruan Bifflemug. Came from the word Best Friend. Was Welcomed into the Hip Hop scene by hip hop artist, when the shizzles and the dizzles were popular. est. 1999-2006 ex.  Then Mutated into Biff for example; Whats up Biff?
by Daniel D'garmis January 22, 2008
 Get the Bifflemug.
Get the Bifflemug. "You spilled coffee on your shirt."
"Well, biffle!"
"You don't have a date for prom?"
"No, I've been biffled!"
"Well, biffle!"
"You don't have a date for prom?"
"No, I've been biffled!"
by Kitty11 May 25, 2008
 Get the Bifflemug.
Get the Bifflemug. a friendship between a girl and a guy that's so close it looks like they're dating but they are too good of friends that it would completely ruin their friendship if they ever dated
by ️Ethan  July 1, 2015
 Get the bifflemug.
Get the bifflemug.