Top definition
Sister + BFF (best friend forever), a word used for best friends who are so close they're like sisters (usually between two girls).
I haven't seen my bifster in a year & now we're finally reunited! We grew up together :))
by RosaMimosa September 16, 2012
Get the mug
Get a Bifster mug for your sister-in-law Zora.

Available Domains :D

  • bifster.se
  • bifster.org
  • bifster.net
  • bifster.men