thunder thighs noun2 •[plural only] (offensive) Fat thighs or thighs of great cellulite or stretch marks.The bulging biceps were exposed and his thunder thighs showed through his fitted black slacks; it made me want to touch him all over to see if he was real. — 2015 •(offensive) A person, usually a woman, with fat thighs.I just got schooled by a fifth grader, I think in amazement as the four-foot-nothing fireball jogs down the court, arms akimbo, stomach heaving up and down. “Ha-ha, there goes thunder thighs!” — 2011
