What accent is this/does it still exist?

I’ve been here 50 years, and I’ve never heard anyone pronounce “chewing” like “chirrin’”. Now, if the person was actually saying “children” then I’d tell you that was Southeast DC, no question.

Yes.
That “Yak” is a Brooklyn boy who went to Hebrew School and has never seen or heard a yak.
Actual Yaks

Yakkety Sax

I agree. What you have there is a trained voice actor trying to sound like a 1940’s movie cowboy.

I kind of wondered about that, because both as a New Yorker and someone who has read learned discussions on that type of accent–perhaps in a thread or two here–I!m not sure if a Brooklyn vs. Bronx vs. generic-over the top NYC can be localized to that one borough.

Note that in your response/cite, Flatbush (as you no doubt know) is in Brooklyn, so Mel Blanc, for one, definitely has come to his own conclusions on what goes into his character’s speech.

ETA:But we don’t know if he is using “Flatbush” as synecdoche for all of Brooklyn (ie, distinctive as a borough as a whole), or that he is specifying just one of other “Brooklyn accents” found in other neighborhoods there.

My wife, who is from Bensonhurst (Brooklyn) claims that accent is “a Canarsie (Brooklyn) accent.”

The devotion in GQ to sharing scholarship and backing up posts with citations is truly impressive.

Sounds a little bit like a Bing Crosby imitation.

You mean this? At 3:20.

Sounds like a mix between transatlantic and north east.

It seems like one of the common old-time Hollywood cowboy accents, as though the voice actor were trying to sound like that guy on Bonanza or something.

Either way it’s most likely an affectation, so I don’t see much point in trying pin it down to a region.