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4. FMS
Foot in Mouth Syndrome:

When you add something to a conversation, which is followed by an awkward silence...

Then you know that you should have kept your mouth shut.
Guy: Your sister is hot
Chick: .......
Guy: (oh that fuckin FMS... shouldn't have said that)
1. FMS
abbreviation for the phrase "fuck me sideways"

Used during a time of aggression when something doesn't go according to plan, not actually as a command.

The abbreviation is generally used so parental figures don't know wtf you're saying.
Person 1: I heard you got rejected by that fly ass bitch.

Person 2: Yeah...FMS.
2. fms
Acronym for Fuck My Spelling. Almost like FML only you say it after you realize that you have horribly fucked up a word.
eYe_fAllEd_sPelleNg0239: So there was this Jahoover witness that came to my door today

eYe_fAllEd_sPelleNg0239: fms

Mister294: /facepalm
3. FMS
Stands for "fecal management system" in the hospital. It is a tube stuck up the anus of someone in the hospital if they are not capable of asking for a bedpan when they need. Used as something derogatory to call a person you don't like by hospital workers.
"I hate that bitch, she is such a FMS."
5. FMS
Fuck My Shit.
can be used in many ways. As a term of Confusion,Surprise or just to show boredom.
example 1: fms, what are you guys talking about???

example 2: fms that really happened!!! :O

example 3: fms, i'm going to bed -_-
6. FMS
Fat Man Syndrome-
The term used to describe the laziness that fat men feel, usually used with sports or house work. Basically, it's when a man uses an excuse such as an injury to avoid work simply because he is feeling lazy.
"Jim was fine at football practice until we had to run windsprints. All of a sudden his FMS kicked in and he told coach he couldn't run because he turned an ankle."

"Bob will come running when I have dinner cooked, but when I ask him to take out the trash he always acts like his old wrist injury is flaring up. I bet it's just FMS."
7. FMS
Full Moon Syndrome

When people behave unexplainably bizzarely due to a full moon! Much more common than is recognised.
Husband: Em dear you do know that you have put your bra on outside your top today
Wife: Oh my god what is wrong with me? Thanks luv
Husband: You best take the day off it looks like you have come down with a bad dose of FMS!
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