Ronnie speaks like many southerners do, black or white. the key to the way that they speak, regardless of color, is the linguistic style known as consonent reduction simplification (crs). wherein, consonents are either omitted(to the listener) or barely stressed as in usual speech. this would, to the listener unfamiliar with a dialect that has this property, probably sound unintelligent, or, like "gibberish."
but still.... how he speaks has nothing to do with his physique.