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1.
its the nastier name for your middle finger..Mainly used for signalling someone to fuck off or get fucked.
jack: hahaha did u see me give that dog the fuck you finger??

sally: hell yes how fucking nice of you...
by wenchypoo February 09, 2009
 
2.
The middle finger. The finger you use to flip people off with.
My fuck you finger is sore from fliping everyone off.
by Deep Blue 2012 August 04, 2009