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A fancy way to say the f word. It came from a dumb joke in 2005 when someone said 'Fack you man' and then the word 'nack' was born from bad tongue movement and bad spelling.
'Nack you, buddy!' he yelled as he tripped over a curb.
'Nack you, I'll see you in hell!' she said after he stole her fries.
'Nack you, I'm out!' he said after getting kicked out of the bar.