herewith, my reply:

here is a complete list of -pygous as found in the OED;
callipygous (well-shaped)
platypygous (broad)
steatopygous (fat)

I think someone was having a bit of a lark by attaching the prefix meaning half (=half-ass?). at least they were consistent and used the Greek prefix.

I've already used calli- and steatopygous (or -pygic) for wwftd, but platy- is new to me so I'll be probably be using that in the near future. actually, it might be interesting to post this question publicly to see what response it elicits from the pygous ones.

oh, and hemiphagic doesn't make any sense: half eater??
now pygophagic....



p.s. - other -pyg- words
dasypygal - having hairy buttocks
pygalgia - /py GAL jee uh/ a pain in the buttocks
(not to be confused with rectalgia or proctalgia)