A regional curse-word originating in the southern U.S.
"Umpdamn" possesses high-linguistic plasticity and acts on times as a pronoun, adverb, and an adjective.
"Umpdammit.!'
"I don't give an umpdamn about no umpdamn, umpdamn."
"I don't know what the umpdamn you're saying."
"Grab me the umpdamn."