CORRECTO-MUNDO-DO-DO

Like, when you're so sure of something, your verbal affirmation sounds like you're about to bust out some Sound of Music.

Dudebro: So, what you're saying is... you're saying what I keep saying you're saying, even though you won't say it?

Other dudebro: CORRECTO-MUNDO-DO-DO (♪a deer, a female deer♪)