The sound a very fat person makes when their roll of fat moves away from and the suddenly hits the "normal" part of the body. This usually occurs when engulfing food/small objects (or children in the case of pedos).
Fat Man: Hello little boy, OMG look over there!
Little Boy: What?!
*FOOMP*
A few moments later...
Concerned Mother: Have you seen my son?
Fat Man: Nope... *struggling sounds coming from his stomach*
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