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Stoopid Girl: I like your music and all but I think you need Soulja Boy on the hook...
Talib Kweli: Girl please. KMS!
Stoopid Girl, dragging on her gum with her talons: Nigga you ain't shit!

Dick Rider: Dude them kicks are too fresh!
The Man: You know This! KMS!
KMS by Kp-Spears June 8, 2009
KMS means Keep Mouth Safe.
"Kylie said she will pee in my mouth. I have to KMS now."
KMS by Global Silence December 2, 2019
an awful acronym never to be used.
kms by beachbum320 October 14, 2015
KMS means “I’m Going to Kill My Self” which girls say the most because there puny little assholes
OMG if he post that again ima “KMS”
KMS by Frustrating that May 2, 2018