"Devil" can mean many things, indeed. Do you think Chavez meant the cunning, slightly stupid, mostly harmless thing that Russians call "chert"? Or the noble Devil of Bulgakov? Or the guys who fart at sinners in Dante's Hell?
No, I think he meant the exact thing he said, the thing you and a lot of other people say all the time: the US president is evil incarnate, obsessed with power, black with pride, happy to torture innocents everywhere for his rotten idea of fun. My point was, that's not something that one country has a right to say to another, not unless they expect to bomb and to get bombed tomorrow.