Rusty Water, Fizzy Gravy 'sans' fizz.

A hot, meaty smelling liquid bowel movement, usually experienced the day after a lukewarm steak bake from Greggs.
"Bloody hell, Susan. I wish I hadn't had that dodgy meat pie on the way home from the petrol station last night. My arse has been streaming botty bovril almost non stop since 5 this morning. My legs are numb."
by effinG123 May 10, 2017
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