posing pouch 
noun
A man’s garment covering only the genitals.In the event, of course, the jamboree was about as modest, understated and tasteful as Liberace in a snakeskin posing pouch....
- I have never truly felt comfortable with the boxer-short phenomenon and I am heartened that our most fashionable retailers report that sales of manly posing pouches are up by an astonishing 40%.
- And don't get me going on posing pouches either.