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(n) Best friends sister syndrome - a diease that results from dating your best friends sister. Symptoms- your best friends sister seems hotter than usual and you have the urge to ask her out. Warning may result in death in some rare cases
Dude, your totally going to get BFSS from dating his sister.
BFSS by Gil Jacobson January 14, 2010
Related Words
Best friend soul mate. This term defines two people who were meant to be, and always will be best friends. More important than best friends, bf, gf, bff ect ect...
Muh BFSM be the shit. always and forever
BFSM by bw77 January 18, 2010
Standing for "Best Friend Soulmate", it is a term used to describe a person as someone you're destined to be best friends with.
Person A: OMG! Michael's so cool!
Person B: I know he's just like you
Person A: He's like my BFSM!
BFSM by Penelope S. May 27, 2013
An acronym for the phrase "Big Fat Slutty Whore." Often used as a joke between two people in a relationship.
Jon: I love you, you BFSW.
Nancy: What?
Jon: Big Fat Slutty Whore.
Nancy: Oh. ...Your mom's a BFSW.
BFSW by The Real BB 2009 August 7, 2010
Short for "butt fucking son of a bitch".
"Man quit being a bfsob".
bfsob by bfsobman October 17, 2008
Who's that?
Oh she's my BFSB.
BFSB by mochida August 19, 2011