"dasypygal (da-si-PYE-gul) adjective
Having hairy buttocks.
[From Greek dasy- (hairy, dense) + pyge (buttocks).]
A related word is dasymeter, an instrument for measuring the..., no, not that, rather the density of gases. Another related word is callipygian, having a beautiful behind.
"That way, if they will just turn their caps through 180 degrees, and the volume of their in-car stereos down a bit, and pull their trousers up over their dasypygal features, there might be hope, yet."
Revel Barker; Open Eye: Fidel Castro And His Part in the Generation Game;
Independent (London, UK); Sep 5, 2000.