Oh. Somebody was peeking.
3 seconds sound clip from the Stalag 17 movie soundboard.
You can hear this line at 01:03:26.192 in the Blu-ray version of the movie.
Quote context
[...]
- Don't worry, Duke, we'll handle it from here on in.
- Well, you'd better handle it fast, before he sells us all down the river.
- What's the matter, boys? My slip showing?
- I'll say it is. You spilled a little borscht on it.
- Borscht?
- Did you have a good time over there?
- Yeah, had a dreamy time. Those dames, they really know how to throw a party.
- There are a couple of blond snipers over there. Real man-killers. They...
- What's this? What happened, Cookie? Who did it?
- Better not be anything missing. This is private property.
[...]