FLS = First Line Support'ers.
Is nice people who help alot, in Forum's.
Helping n00b's, like live FAQ.
by Ohke November 14, 2006
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FL Studio or FruityLoops Studio is an instrumental/beat making program used by many professional producers to make music.
A: Deem001 uses FLS.
B: What's that?
A: FL Studio or FruityLoops Studio. :
by TheGosuBox January 15, 2010
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Fat Leg Syndrome. A woman with fat thighs and legs. Most likely fat ankles too.

--Taken from Ray and Norberto.
That girl has FLS!
by GMoney Musikbyg January 31, 2009
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Flu-Like Symptoms (fever, chills, headache, fatigue.)

The acronym is used heavily in the medical community. It has yet to have been thrown around wildly on television medical dramas, so it's not part of the pop-culture medical lexicon.
John has had FLS for three days now, I think he might have the flu!
by MeakPhronkey December 21, 2007
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Fake Lesbian Squad: The wanna be lesbians at any school
"Look Ryan, here comes the FLS." or "Anoryia! The FLS is growing!"
by Ohgeegee September 5, 2018
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Short for Fat Leg Syndrome. Occurs when you wear boots that are too big and they give you the appearance of fat legs.
Liz wore size eleven boots that she got on sale, even though she's a size five. needless to say, it gave her FLS.
by lizisapiz March 11, 2010
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Short for Fake Lat Syndrom. FLS is when you use your side to push up your biceps so they appear larger.
Girls: Yo! Dayden's biceps are so BIG!!
Guys: No he just suffers from FLS
by Major Wang July 8, 2017
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