crap-shy
When your taking a crap, either in a public restroom, or at a party,but flush before you let it out, to cover the noise of the crap because you feel nervous about what people will think about you and your hygiene.
Guy 1: Does Jimmy ever take a dump?
Guy 2: Yeah, but he's crap-shy so you cant hear him.
Guy 2: Yeah, but he's crap-shy so you cant hear him.