One who is having a bowel movement and makes various grunting or groaning noises when passing a turd.
Some vocal crappers may also narrate what is happening as they take a shit, this is more likely to happen as the crapper is having a Crap Attack.
Co-worker 1: Man, I could hear everything that was happening to John when he took a shit this morning.
Co-worker 2: What do you mean?
Co-worker 1: I could hear him groaning and describing what was happening when he took a shit!!
Co-worker 2:Yeah.... He is a Vocal Crapper.
3👍 1👎