An abbreviation used by members of the online fetish and BDSM community for the website FetLife. Commonly used on dating profiles to reach other FetLife members without writing out the entire word to avoid outing themselves to non-members.
Did you see my post on FL?
by The All Knowing Condom August 1, 2019
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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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Charlotte: THE FL OF MOANA IS SO GOOD AND SHE'S CUTE
by Iuna March 9, 2022
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Condom. Short for "French Letter," a term used for condoms by soldiers during the two Worlds Wars in Europe, but almost never spoken in full.

Spoken as ef-el.
I don't wanna catch the clap but I'm plumb out of bloody FLs.
by paulpaxman September 5, 2009
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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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