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A thong or tight outfit that a videogame character, particularly mid or final bosses wear, to expose their rippling buttocks.

Good examples of characters with boss thong are Gill from Street Fighter 3, Goro and Kintaro from Mortal Kombat, the Tyrant from Resident Evil: Outbreak, and Heihachi from Tekken 4.
Heihachi beat my ass while I was distracted by his mighty boss thong!
by SHOH August 16, 2006
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