F.L.S. 

1.)A vague, fake medical condition that sounds serious but actually means that you Feel Like Shit.

2.) often used to call out of work, to aviod someone you don't want to hang out with, etc.

"Dave can't come in today, his F.L.S. is acting up again."

F.L.S. by Klitzke May 18, 2008

R.O.F.L.S.H.T.E.T.I.G.U.I.F.D.A.T.H.M.H.O.A.T.A. M.M.H.T.T.M.T.T.H.A.B.I.L 

rolling on the floor laughing so hard that every time i got up i fell down again then hit my head on a table and my mom
had to take me to the hospital all because i laughed.

The other day I was R.O.F.L.S.H.T.E.T.I.G.U.I.F.D.A.T.H.M.H.O.A.T.A. M.M.H.T.T.M.T.T.H.A.B.I.L ... it was kind of embarrassing.

R.O.F.L.S.H.T.E.T.I.G.U.I.F.D.A.T.H.M.H.O.A.T.A. M.M.H.T.T.M.T.T.H.A.B.I.L by Omnibender February 22, 2011

R.O.F.L.S.H.V.U.A.K.O.M.A.I.L.

Rolling On Floor Laughing So Hard Voldemort Uses Avada Kedavra On Me And I Live.

Person 1: *tell a joke*
Person 2: R.O.F.L.
Person 3: R.O.F.L.S.H.V.U.A.K.O.M.A.I.L.!!!

R.O.F.L.S.H.V.U.A.K.O.M.A.I.L. by Wrathchild11 December 16, 2010

C.F.L.S. 

Chronic Fatigue Lethargia Syndrome: When one is sporadically overcome with the inability to do a damn thing.

Mom: Do the dishes. Your sister made the dinner.
Son: No bitch. I ain't doin the dishes. My C.F.L.S. is kickin in.

C.F.L.S. by Drea Marie April 7, 2007

S-F-L-S 

FROM STRANGER TO FRIENDS, FRIENDS INTO LOVERS, AND STRANGER AGAIN.

friend 1 "Well you know how my relationship goes, s-f-l-s."
friend 2 "GOD! you're pathetic."

S-F-L-S by cjjninoh August 20, 2021

S-F-L-S 

It means, Strangers to Friends to Lovers to Strangers.

"From Strangers to Friends, friends into Lovers and Strangers again." It is from the song Strange by Celeste, please go listen to it. It is absolutely beautiful.

"You know how relationship goes, s-f-l-s. Nothing ever lasts."
"S-F-L-S, we are in the love part right now, so I have to ready for us being strangers again."

S-F-L-S by cjjninoh August 20, 2021

F L D S 

Feel Like Dog Shit. A disease identified in 1988 by a guy they call JD from Rio Hondo, Texas. Symptoms include any or all of the following (and maybe more, as yet, undetermined):
Headache, Body Ache, Lethargy, Chills, Post Nasal Drip, Itchy/Scratchy Throat, Sinus Pain, Random Dental Pain, Neck Pain radiating up and around the temples, Ringing of the ears, Twitchy feet that keep you awake at nights. Halitosis, Eyes Sensitive to light. (research continues)

Joe: "Hey dude, you're not lookin so good today. Wassup?"

Moe: "Fukin F L D S got me by the cajones......(looking down, shaking head) ...fukin F L D S"....

F L D S by buzzardbait February 26, 2011