Quite possibly the most stupid thing I've ever seen or heard in my entire life.
This is some new hashtag/trend on Instagram. It's just a made-up name for the crease, fold that forms between a woman's upper thigh and their hip when they bend forward, sit, or kneel. It's basically part of the whole booty trend, where bigger is better since thicker hips and a big butt tend to create more thighbrow. Seriously?