When you can see someone's genitals through a hole in their undergarments or, if they are "going commando", through a hole in their pants.
Tyanna: "Dude put on some real underwear I can see your balls."

Jami: "No, I am rockin' it tarpless."

or

Tyanna: "Dude you're tarpless."

Jami: "I know, Tyanna I know."
by The Dorky Darky May 11, 2010
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