How many syllables does "orange" have, and what regional dialects show a difference in that number?

To judge from the dialect that Andy Griffith uses when he says "big orange drink" (at roughly 0:35, 0:48, 3:03 of the video) in his comedy piece "What It Was Was Football," at least some people in rural northwestern North Carolina pronounce orange as a single drawled syllable that resembles "arnj." Griffith was from Mount Airy, North Carolina, close to the border with Virginia.

In southeast Texas and central California, I've heard some people pronounce orange as if it were spelled "ornj." But I've also heard many people in both places pronounce the word as two syllables ("orenj")and in Maryland and New York I've heard a different two-syllable pronunciation (akin to "arenj"). The upshot of all this is that pronunciations of orange vary considerably in the United States. Merriam-Webster's online dictionary, for example, lists four principal pronunciations:

or·ange ˈär-inj, ˈär(-ə)nj; chiefly Northern & Midland ˈȯr-inj, ˈȯr(-ə)nj

If you've never heard the two-syllable ˈȯr(-ə)nj pronunciation in the wild, you can click the audio button on that page to hear it loud and clear.

Say it. Does your jaw open twice, or does it open once? When I say it, even pronouncing it or-ange, my jaw lowers once while my mouth widens to pronounce the last part of the word. Almost as if I were mimicking a fish. Say orange, then say button. Button hits twice, orange once. The separation helps with initial pronunciation, but after that it feels like it would be one. I'd ask about the definition of 'jerk', but I think some of these answers have already covered that.