An article of clothing created when a frat bro or any gym-oriented young man rips the armpits of his tank a bit too much, therefore resulting in what is basically a sweaty double-sided cape.
Kyle: Yo, check out my new tank. It shows off my guns.
Mack: Bro, the chicks will love it. They can totes see your nips.
Kyle: Sick, man.
Carly: Nice douche tunic, asshole.