The oversized belly of an individual who appears to be thin in regular clothes, yet has a disproportionably large tummy.
Source: Quatto was introduced in the 1990's movie Total Recall. Quatto lived in a man's stomach while visiting Mars and became famous for the phrase, "Quaid, Release your mind". Unfortunately, Quatto's acting career came to a screeching halt when he was shot in the head.
Seriously you stink Russ, stop feeding quatto buffalo wings?
Nice shirt Todd, but I didn't know we were bringing quatto to the party.
Let's stop here, Quatto's really hungry