New York City is called the “Big Apple,” not the “Big Potato.” However, Betty White, playing the character Rose Nylund on the television sitcom The Golden Girls, the “Sick and Tired” episode that originally aired on September 23, 1989, said:
     
“It’s going to be a great trip (to New York City—ed.), you wait and see. You’re going to be cured, and I’m going to get to see the Big Potato!”
   
       
Wikiquote: The Golden Girls
The Golden Girls (1985–1992) was a popular NBC sitcom about four previously married over-50 women who live together in Miami, sharing their various experiences together and enjoying themselves despite hard times
(...)
Cast
Bea Arthur - Dorothy Zbornak
Betty White - Rose Nylund
Rue McClanahan - Blanche Devereaux
Estelle Getty - Sophia Petrillo
     
IMDb (The Internet Movie Database)
The Golden Girls (1985–1992)
Sick and Tired: Part 1
TV-PG | 30min | Comedy, Drama | Episode aired 23 September 1989
“Sick and Tired: Part 1” is an episode of The Golden Girls starring Bea Arthur, Betty White, and Rue McClanahan. Dorothy says that she is seriously ill, but none of the doctors she sees believe her.
Director: Terry Hughes
Writers: Susan Harris (created by), Susan Harris
 
Wikiquote: The Golden Girls (Season 5)
The Golden Girls/Season 5
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Sick and Tired [5.01]
Blanche: What a waste, Rose Nylund in New York!
Rose: [to Dorothy] It’s going to be a great trip, you wait and see. You’re going to be cured, and I’m going to get to see the Big Potato!
[Blanche gives Dorothy a “See?” look]
Dorothy: I said she was comforting, I didn’t say she was smart.
       
Springfield! Springfield!
The Golden Girls (1985) s05e01 Episode Script
Sick and Tired (1)
(...)
What a waste.
Rose Nylund in New York.
It’s gonna be a great trip.
You wait and see.
You’re gonna be cured.
And I’m gonna get to see the Big Potato.
I said she was comforting.
I didn’t say she was smart.
   
Twitter
Jennifer ❄
@arIenefrancis
@therealpduffy Good luck at the Upfronts tomorrow, dear, and enjoy the Big Potato (it’s a Golden Girls reference, teehee) 😏🍎💚
6:58 PM - 13 May 2014
 
Hello! magazine
‘The Golden Girls’: Their best zingers 30 years later
By Erica Cupido
SEPTEMBER 30, 2015
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ROSE
Rose Nylund (Betty White) always saw the world through rose-coloured glasses. This kind-hearted character kept audiences in stitches with her naïve observations, while she schooled her pals in her many hometown customs.
Blanche: “What a waste, Rose Nylund in New York.”
Rose: “It’s going to be a great trip, you wait and see…I’m going to get to see the big potato!”
 
Twitter
Iman Matay
@imanmatay
So I’m watching Golden Girls and Rose called New York City the “ big potato” instead of the “ big Apple.” Y’all when I saw I am HOLLERING! 😂😂
7:05 PM - 3 Jul 2018