To describe someone or something as rancideous is to say that they are the absoluteepitome of being ugly or unpleasant.
That person over there is so completeley rancideous that if I have to continue looking at him, my eyes are going to explode and my head will catch fire.
This meal is rancideous. I hate it. You have insulted me by asking me to eat it. I wish you would die.
when reffered to an object: sucks, adj.
when refereed to yourself: screwed, adj.
object version: You have to quote 100 lines of McBeth for schoool tommorrow? THat's ranctious
Personal Version: I'm so ranctious cause i didn't do my essay on Hamlet that's due today.