Top Definition
Any mucous-like liquid that unexpectedly seeps from one's rectum; usually after a scorching case of diarreah.

Rectal gravy generally has a foul smell worse than that of generic diarreah.
In math class I tried to let out a silent fart when out come some rectal gravy. The whole classroom smelled of septic sludge.
by Navin_Johnson January 06, 2008

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