Something without sugar.
4 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:38:29 in the Blu-ray version of the movie.
Quote context
[...]
- Yeah. Give me-Give me a Tab.
- Tab? I can't give you a tab unless you order something.
- Right. Give me a Pepsi Free.
- You want a Pepsi, pal, you're going to pay for it.
- Just give me something without any sugar in it, okay?
- What do you think you're doing?
- Biff.
- I'm talking to you, McFly, you Irish bug!
[...]