1 definition by rosemaria

Top Definition
FIS
Fucking Ididot Slut

the name you call a person who makes bad decisions and sleeps with a lot of people

a FIS is usually female
a FIS usually is a person who is or at one point was your friend

a FIS is a person including but not limited to:
-a 'friend' who has sex in front of you
-a 'friend' who has sex with the person who are fond of
-a 'friend' who makes fun of you for not having sex all the time
-a person who smokes TOO MUCH POT, smoking pot does not make them a fis but if it becomes ALL they talk about and do, then they just may be an FIS
1: "OH MY GOD, we were hanging out with that boy i like and she just fucked him, right in front of me!!!"

2: "what a FIS"
by rosemaria July 10, 2008

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