FSS 

acronym for Freshman Slut Syndrome. The period of time, often in the first weeks of fall semester, where freshman girls have sex with every guy they meet at a party.

I heard Jen fucked 5 guys this week!
Yeah shes got a major case of FSS

FSS by Tit1 July 10, 2009

FSS 

The acronym for "Fake Sickness Syndrome"
FSS normally sets in Monday-Friday before 8am. FSS is used to get out of everyday task like Work & School etc..
Symptoms of FSS consist of: Fake fever, fake coughing, and of course fake vomiting. If you have any signs of FSS please, dont dispare hope is there.

Wayne: Yo Jose is Kendall at school today.
Jose: Nah man that nigga got FSS earlier this morning.

FSS by Shallah Un Monk June 11, 2006

FSS 

Facial stripper slide

I fucked a nose and mouth in a straddle position yesterday. I love it when he lets me FSS.Nothing better than watching my pussy slow rolling on a face...his hands clenching my ass as encouragement

FSS by Haro65 June 22, 2018

FSS 

full send squad
does nothing but full sends

Grace- broooo let’s make the FSS cause all we do is send it

Ella- so down

FSS by itsbeacauseloganpaulwastaken August 9, 2018

FSS 

Fucking ShitShow. Used to describe a disaster of epic proportions. Almost as bad as a flaming dumpster fire.

This process has been a FSS from the very beginning.

FSS by dabecka October 21, 2020

k'fss 

ass sparking

I'm gonna k'fss your ass

k'fss by niggaboi12380127 March 30, 2009

fssw 

Full service sex worker.

A fssw is someone who engages in sexual intercourse for currency.

fssw by docjennifer December 17, 2016