short for f#!k you mother f*^$&r
'Man you suck'
'fumf, ill beat your ass'
by Angel,king of the mountain November 25, 2004
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fumf - fucked up motherfucker

Usually used if we are describing someone crazy or out of their mind.
John: Hey man! Did you see James?! He was driving 150 MPH on this short, narrow street!

Jerry: Yeah. He really is a fumf.
by Khorin April 21, 2008
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For anyone who it was said to, punch the person who said it to you
It is an acronym of "Fuck You Mother Fucker"
If you do not know the meaning of such words, just click these links - fuck,fucker
We can use it like-
What the fuck nigga?! Why did you have sex with my girl?? FUMF
Or simply-
FUMF!!
by XTINCTION February 25, 2019
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Guy1: I no you are, but I am not.
GuY2: FUMF
by Digmor July 5, 2013
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