going down on someone while they have a shit.
As I was laying a particularly large and putrid grogan in the shitter my wife crouched before me and gave me a bumbler.
by mickyhomer August 18, 2003
A clumbsy idiot who happens to be funny looking too.
Casey ran into the tv and boom crash boom bang. Things were broken yet Casey looked funny when doing it so people called him a Bumbler.
by Brian February 27, 2005