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Sack Tack is the unfortunate male predicament when his sweaty scrotum sticks to the sides of his thighs.
Damn Tom Smith, you got some serious sack tack.
Sack Tack by wkb October 5, 2007

Tack in my sack 

To describe a very Annoying person or situation.
You're irritating the shit out of me, quit being a tack in my sack.