The curvature of one's booty, in density, mass, and thickness, resembling that of an egg.
This definition hatched just after a single egg took precedence over Kylie Jenner for most-liked photo on Instagram. To which Fashion Nova later paid homage by reproducing the image of the egg wearing a pair of classic high-rise denim, cracking a joke that went over easy.
“That booty is egg-stra thick, it’s crackin’!“
“Did you see that egg-stra thick booty? That’s one thick chick.”
“If you wanna get laid, Fashion Nova jeans make your booty look eggs-tra thick!”