Search data says men ask about hip dips constantly. Clinic websites say almost nothing back. Consider this the reply.
The geometry is unisex: greater trochanter position, pelvic shape, fat distribution. Men's narrower pelvises and different fat patterns make pronounced dips statistically rarer — but taller frames, lean physiques and certain bone geometries produce them regardless, and cutting or serious training unveils them exactly as it does in women. If yours appeared when you got lean: nothing went wrong. You uncovered your architecture.
Men's body-contour concerns get either mocked or monetised online, rarely just answered. Same policy here as everywhere on this site: hip dips are normal anatomy, correction is an informed preference, and "your line is fine as it is" is an answer men receive too. Photos in, straight answer out — discreetly, and without a template.