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Stands for "foot in mouth", which is when you say something incredibly awkward without giving it much thought beforehand.
"I totally had a FIM moment last night at Evan's party."
FIM by Kay Bee August 7, 2012
Related Words
fimp FIM FIMA Fime fimbs FIMO fimbo Fimba Fimble Fimple
(Texting)

Payton: I’m gonna go to that party
Kate: You can’t you’ll get grounded
Payton: FIM
FIM by Raspberry_21 January 27, 2018
(Texting)
Payton: I’m gonna go to the party on Friday
Kate: You can’t you’ll get grounded
Payton: FIM
FIM by Raspberry_21 January 27, 2018
Fim is an alternative word for heck, usually used as the emo version. Created during a fit of laughter.
John: "ur mom"
Gerard: "WhAT ThE FIm JoHn"
Fim by burnrai June 1, 2019
Female who identifies as Male.
I was born female but I identify as Male. I'm a FiM.
FiM by WordsyMe February 21, 2020
(F)uck (I)t (M)entality; (letters are spoken, it is not said as it sounds) When you are absolutely making a bad decision, but you decide to go through with it anyway because why tf not. The time for regret is on your deathbed.
“Should I do it?”

Yeah man, FIM! Fuck it mentality!”
FIM by DumbBitch2.0 September 28, 2021