[TOMT] Movie I watched as a kid likely from the 80’s/90’s

Very vague I know but the only scene I remember is the main character, who I think is some kind of rich kid since I remember the house being huge, brings a girl to his house, wherein she asks for something to eat, as she’s eating she says something to the effect of “This is good, what is it?” And the boy, spaced out, responds with “dog food” as a joke. I remember liking the movie but don’t remember anything else about it, and I only remember the scene because I remember being amused by the fact my step dad said the phrase “dog food” before the character in the movie, indicating he had seen it before. I watched it on tv probably around 2003/2004 but the movie is probably from before then. Would love to know what movie this is.

Edit: These weren’t children they were high school or possible college age.