She's 'rotten to the core'. [=she's a very bad person; she's a very dishonest person]
('Brit') He fancies you (something) 'rotten'. [=he likes you very much]
I feel 'rotten' [=I feel guilty; I am upset] about what I said.
(..) Whoa... Is that blood? Oh, shit. What's your medical diagnosis now? It fucking stinks. Oh, shit. Careful. These steps are old and rotten down here. - Yeah, like this whole freaking house. - I know. Smells like burned hair. I think it's back there. (..)2013 Evil Dead