Abbreviation of Mother Fucker.
LOLINTERNETS
n00b:OMG OMG YOU STUPID MTF!!
pro:Fuck you mtf!
n00b:Mtf Wat Lol
random:Whats mtf?
pro:Mtf is mother fucked lolinternets lol
random:oh.
random:...
random:...
pro:boom headshot mtf.
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