iliac furrow
n.— «“I am filled with bitter resentment and burning envy at the sight of this young fellow’s pronounced iliac furrow.”…“There is reason to envy someone skinny enough to have such a pronounced apollo’s belt. i often tell people that i have one, but that it’s just covered in a layer of fat.”…“round here we call those cum gutters.”» —“Apollo’s belt” We, Like Sheep May 2, 2007. (source: Double-Tongued Dictionary)