fmy means Fuck My Youth. Used when you are too young to drink, have sex, go to clubs, ect. Also used when you do whatever you want anyways regardless of your age as if to tell your age...hey..fuck you.
did you fuck with mand and manny?

yeaahhhh FMY!
by f-shat-up February 17, 2011
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I fmy
by Ck29 September 30, 2016
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