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A glass of beer (or any cold alcohol beverage for that matter) that you serve to someone and they drink it unaware you dipped your nuts in it moments ago...

If it was a martini though it culd be either a nut-ini or a balltini, either works...

Guess what a Fartini is...
At a party:
Guy "How'd you like that Nut wine, Shirley"
Shirley "It's okay... but i don't taste the nuts..."
Guy titter titter
pause, the penny drops
Shirley "EURGH! Oh my God, you put your sweaty balls in this didn't you?! ACK! You're fucking disgusting!"
by cha cha chaa September 15, 2010