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1. fss
IM acronym for Fucking Super Sweet
Steve: I got the job!
Smith: FSS!
2. FSS
Fosho Shawty
You: Yo we goin to da movies tonite?

Friend: fss
3. 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
4. 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.
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