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Short for "Full Of Shitness"

A serious condition in which a person chooses a malady to be a victim of. This malady is usually vague, chronic and untreatable such as a "bad knee."

F.O.S. will tend to flare up when the person is confronted with a situation they would rather avoid.
"Is Robbie coming to your birthday party today?"

"No, she texted me yesterday. Apparently her F.O.S. is acting up, making it impossible for her to walk on her bad knee."
F.O.S. by mizJD January 10, 2010
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f.o.s - faez obsessive syndrome 

tw// pallas
when sum hoes have an obsession with the best hottest and smartest twitter user @bunnnisz... usually the obsession comes from users @hippoddiamandis and @witchdiamandis bcuz they are obsessed whales
* under faez post *
a: omg this flopped as usual

b: wtf how obsessed can you be get help because u have f.o.s - faez obsessive syndrome)

*other tweet*
a: ......if this flops its faezs fault / faez hacked me
b: again you're bringing faez in... get help with ur f.o.s WHALE

l.m.a.o.s.h.m.s.f.o.m.h.a.i.d.m.t. 

Laugh my ass off so hard my sombrero fell of my head and I dropped my taco.
Steven told a joke and Brenda replied with l.m.a.o.s.h.m.s.f.o.m.h.a.i.d.m.t.

And they all laughed! THE END!!!

M.o.b.; F.o.s. 

Money over bitches, flowers over snitches.

It was made famous by rapper Lil Wayne in the song 'Big Dogg status'.
Mike:Fuck girls and rat bastards.
Dave:Hell yeah. M.o.b.; F.o.s.
M.o.b.; F.o.s. by BoVice79 January 25, 2011

W.A.F.O.S. 

White artist from outta state.

In 2000-2001 a group of (primarily caucasion) brooklyn natives came up with this term to categorize the group of people who seemed to be moving in to all of their neighborhoods. Far from a derogatory term, it was actually just a more descriptive way to refer to this demographic than the alternative "hipster" or "emo-kid". The natives in fact encouraged one another to "embrace the wafe", as a means accepting the inevitable changes brought on by gentrification.
"Some of my best friends are w.a.f.o.s."

Or

"dude was really wafing it out"
W.A.F.O.S. by kool kear July 3, 2007
(n)def. White artist from outta state.

What native, African-American Brooklynites call the suburban
post-hippie/alt/click/emo/rocker/indie-hop/stencil artists that fervently head for the Brooklyn,NY area from various mid-western cities, as to be immersed in the, NYC "hipster set."

syn.)(n) poseur.
Yo, we were at this loft party in D.U.M.B.O, and it was mad W.A.F.O.S up in that spot, real...
w.a.f.o.s by Icey St. Ides June 11, 2006
Fruitcake On A Stick
Is frequenty used as a profanity, or as an offensive weapon.
I got this fruitcake at a wedding, and I jammed a stick in it, and now I have F.O.A.S.

Me: *hits you with F.O.A.S*
You: OW! Stop hitting me with F.O.A.S.!
F.O.A.S by ImNotJimboJones July 10, 2010