Don't sweat it, sweetie. I won't tell.
4 seconds sound clip from the Animal House (1978) movie soundboard.
You can hear this line at 00:47:36 in the Blu-ray version of the movie.
Quote context
[...]
- I have a husband named Dean Wormer at Faber.
- You still want to show me your cucumber?
- Nothing for me today, thanks.
- It looks like you gained some weight since you came in.
- It's just a prank. I'm pledging a fraternity.
- Don't sweat it, sweetie. I won't tell.
- Well, we're having a little party at the Delta Tau Chi house tonight and you are cordially invited.
- I'm old enough to be your mother. Almost.
- Besides, I have to go to the goddamn senior honors dinner tonight.
- Well, maybe some other time.
[...]