Sou americano, e acompanha esse fórum para me ajudar a entender português. Tá dando certo. Gosto desse fórum.
Quando alguém diz "you're the man", significa gosto muito de você. Isso mostra muito respeito e admiração, mas BEM informal.
Obama meant it as an informal way to show a lot of respect. It means he really enjoys And likes Lula. The important thing about it was Obama chose to use a slang and everyday method to say it. I think this shows it was a very sincere statement on his part.