"Fish called Wanda." 
Hmn… You don’t mean:“Tatanka !”?
And how about: “Eddie-eddie-eddie”
“Zuluuuuuu !”
Nell
Snakes.
“Go!”
Raiders of the Lost Ark.
Let’s clean up a few that have been left dangling:
Hope.: Shawshank Redemption. Doesn’t fit the OP, I think. Isn’t the full quote “I hope.”(?)
Maria: West Side Story
To-GA!!: Animal House, obviously.
Mammy!: The Jazz Singer
Klaatuu: The Day the Earth Stood Still. (But was that ever uttered as a stand-alone line?)
Neeerrrrddddsss!!!: Revenge of the Nerds
G’day: Crocodile Dundee
“I love West Side Story, but there is a mistake in it, a great big blaring mistake in the movie of West Side Story. Did you see it? You know the story, the Sharks and the Jets, and there’s this guy called Tony. He’s a white guy. He’s Wonder Bread white. He’s a white, white, white, white guy. White, white Tony. So Tony, white guy, runs into this completely Latino, Puerto Rican neighbourhood, and yells MARIAAAAAAAAAAAAAAAAAAAAAAAAAAAA! And only ONE WOMAN comes to the window. You yell ‘Maria!’ like that in my Italian neighbourhood, forty fat women in aprons. ‘Whaddya want?! Shut up!’”
- Lea Delaria
“Cheeeeeeese!”
Savvy?
“None !”
TV shows, not a movie ( hey, I’m not the first ) :
“Spooooon !”
“Impudent !”
" Shiny!"
No. But since it was the name of a somewhat cheesy band in 1979 (which was rumored to be the reunited Beatles recording under a phony name), I figured it had adequately entered the cultural zeitgeist on its own.
Speaking of indirect Beatles references, I’m mildly surprised nobody got “Kaihili!”
Eeeliiiioooott.