The state of your mouth when you wake up after a night of boozing, smoking, drinking soda, eating cheetos or any other plaque inducing activity. When it feels like someone went number 2 in your mouth overnight. This is the extreme condition, slightly worse than crotchmouth.
Man, after passing out at that party after yacking I woke up with the worst dumpmouth.
by Burt Gummer September 07, 2006
1 more definition
adj; when someones breath smells like they are sucking on shit.
Hilda's dumpmouth is so bad that it could knock a buzzard off a shit wagon.
by Your mom February 20, 2004