1 definition by Siaidhwbdis
The slightly brown coloured whippij that is often acquired after strenuous physical activity or a stressful experience. One would be particularly susceptible to bum gravy if it was an extremely hot day.
*Sun beaming down on Jeremy*
Jeremy: "Guys, does anyone have a tissue?"
Friends: "No, why?"
Jeremy: "I can feel the bum gravy brewing again"
Jeremy: "Guys, does anyone have a tissue?"
Friends: "No, why?"
Jeremy: "I can feel the bum gravy brewing again"
by Siaidhwbdis February 10, 2017