horrible and atrocious, or any other "bad" word ending in -ous
his singing was so horrendous people demanded their money back.
can be defined by the general reaction of a sleeping mother being woken up by the sounds of her extremely stoned son stumbling into the house and singing the theme song to Dave Chappelle's skit "The Niggar Family" at roughly 2 o'clock in the morning...usually followed-up by a slap up the side of the head.
"Jimmy, what the fuck!?! Do you know what mothafuckin time it-"
(Mother's reaction was clearly horrendous)