A local radio station used to play a snippet of dialogue - a man’s voice saying “Hey, that’s great” - a couple of times a week. It sounded a little like Ben Stein from Ferris Bueller saying “Bueller? Bueller?”, but in a more lively (and not purposefully boring) tone of voice, with almost a laid-back-California vibe. Slight emphasis on the last word of the phrase.
When I worked in a radio station, we used to periodically get comedy cuts that we could use as drop-ins during radio shows. Some were clips from movies, but others were just non-sequiters recorded in a studio for stations to use.
I don’t have the answer, but I do remember hearing it in radio spots. I just don’t remember whether they were part of a commercial, or just a stock radio drop.
Does it include “man” at the end? I have a definite memory of a clip with either Cheech or Chong (I never really knew whose voice was whose) saying that.
Oh god I love that movie! Btw, that line is “That’d be great” which means nothing on its own as a quote, but as you know from seeing the film and hearing the quote in context, hearing it anywhere in any context from now on will be enough to start a fit of giggles.