Some say Brooklynite, Curly Howard, said "Joisey", with The Three Stooges. I haven't found any examples except from the 2012 remake where they connect with the Jersey Shore cast. When I was very young my uncles would turn off my cartoons to put The Three Stooges on at my grandpaerents' house in Cherry Hill, so I never liked them and still am not a big slapstick fan, even though at that young age, I hypocritically loved Tom & Jerry (basis of Itchy & Scratchy).
Anyway, Curly did have some expressions like:
"I'm a victim of soikemstance! [circumstance]"-used to express uncertainty
"Soitenly!" ("certainly")
"I'll moider you!" ("I'll murder you!")
"Joisey" would be a logical extension of the mispronunciation. If Curly Howard never said, "Joisey", then I like to think Jersey Joe Piscopo probably got some inspiration from Curly.
An album,
New Jersey, for Columbia Records, followed in 1985 and an
ABC special called
The Joe Piscopo New Jersey Special in May 1986.
New Jersey Vice | | Short Movie |
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Curly Howard - Wikipedia
Joe Piscopo - Wikipedia
edit: I guess Piscopo said, "Jersey", not "Joisey" after all. It's been so long. I can never read or say "Jersey" without an exaggerated accent though.