They found a little bit of that pink slime.
3 seconds sound clip from the Ghostbusters II movie soundboard.
You can hear this line at 00:53:17 in the Blu-ray version of the movie.
Quote context
[...]
- Shh. He's asleep. Come here.
- So what happened with my apartment?
- Well, the guys spent the whole night there.
- They found a little bit of that pink slime.
- Oh, God. Well, what am I supposed to do now?
- You are supposed to get dressed and get crazy with me on the streets of Manhattan tonight.
- This is exactly what you need.
- I have got you a babysitter.
[...]