After doing a shit and not wiping properly, when your butt gets sweaty it produces a gravy like residue, Leaving marks on your underwear.
by Jimmywhack August 23, 2016

example 1: nice to see that your in today "gravy bum".
example 2: andys not going to be in today hes off sick.
"i bet he has gravy bum"
example 2: andys not going to be in today hes off sick.
"i bet he has gravy bum"
by yesson20 December 18, 2011

Used to describe the physical appearance of diarrhoea, including its often impulsive behaviour (and/or occurance after eating mcdonald's). Also used as crude humour to describe one's symptoms.
Joey's been knocked down with a case of gravy bum.
I got terrible gravy bum after having that quarter pounder!
I got terrible gravy bum after having that quarter pounder!
by Blank__ January 21, 2009

by Rees September 15, 2005

by Anonymous May 15, 2003

by KnightstarExpress May 21, 2003

by steven bakewell August 10, 2006
