fnsf 

someone who spends their friday nights at home online

guy 1: hey! where were u on friday nite?
guy2: umm, just at home on WOW/fb/myspace
guy1: ur a fnsf (friday night sad fuck). hahaha sad fuck.

fnsf by binkyj December 9, 2008

fnsw 

Fuck you in a non sexual way. Also known as FYNSw

Guy 1: You are retarded
Guy 2: FNSW
Guy 1: Chill man

fnsw by FNSWChill May 7, 2017

fnsed 

An urban slang which means to steal.

"Dang, Shakara fnsed his virginity."

fnsed by Lincoln Maner November 24, 2015