adj. A regional alternative to "bippy-awful".
Real citation: "This week Charlie laughed at the glaring bum-awful rubbishness of Orange's current I Am Who I Am Because of Everyone advertising campaign, which somehow manages to be cloying, irritating, pretentious, irrelevant and baffling all at once: 'If ever an advert deserved a punch in the face, it's this one.'"
(Charlie Brooker, Aug. 11, 2008, The Guardian, http://www.guardian.co.uk/commentisfree/2008/aug/11/children.foodanddrink)
Made-up citation: "Does an elderly, penis-tumor-having Elvis and an elderly, cuckoo black guy (who thinks he's JFK after an LBJ-ordered paint job) taking on a soul-eating mummy in a nursing home sound like a bum-awful movie to you? If so, think again, and rent Bubba Ho-tep--my new favorite movie."