The end product of a dude's failure to wipe his ass well enough. Remnant fecal matter is spread around between the ass cheeks creating a warm vegemite paste of shit that becomes too uncomfortable to ignore. Particularly bad on hot days or when exercising. Often leads to shit streaks in the underwear.
Dudes - wipe your ass. You shouldn't have to go back after an hour and to clean out the man gravy.
(While running) Fuck - I didn't wipe good enough and now I've got man gravy.
Girl to boy: Dude, no WAY an I going down there. I smell man gravy.
One dude to another, observing a fidgety dude: That guy must have some angry man gravy going on.
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