Top Definition
The medical term for the resulting effect of a male being grossly overweight to the point where ones penis retracts back inside ones body.
"I've heard back from my GP with my test results, turns out I've got a severe case of Bellybellenditis!"

"Fellatio is an absolute nightmare with my other half, he suffers terribly with Bellybellenditis!"
by EL+MB February 21, 2012
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