An exclamation used to indicate when one has tried to be witty but has failed horribly (especially when intoxicated). Often used in those awkward silences after someone has tried to use a witicism among a group of friends. One may use "wampuh" against a friend or one may use it on themself upon realizing their failure at impressing others with what could have been scathing wit.

When you eat dirt for the first time and leave your family to build a shack in the woods