The outline of undergarments that show when girls wear uber tight hottt pants/jeans, which is said to be unnatractive, so they wear thongs.
Props to Nick and Katie (who love eachother very much) for helping me define this word by giving me the necacary information.
ERIN is simply in here because she is cool like that.
Katie wears a thong so a panty line does not show. And because she is hott like that. And because Nick is hott like that.