It means Retarded+Braindead+Fucktard+shithead+don't know shit=filfingerfoos

How to say:
Fil-finger-foos
person1:Im a Filfingerfoos man

person2:lmao
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Lil Timmy:look mom its a filfingerfoos
Mom:SHUT YOU'R DAM MOUTH TIMMY
Lil Timmy: sowwy mommy
by Crooton November 5, 2017
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