This time, it's bye-bye.
3 seconds sound clip from Darkwing Duck - Just Us Justice Ducks Part 2 (S1E21).
You can hear this line at 00:18:31.119 in the DVD version of the TV Series.
Quote context
[...]
- Fearsome Five, get over here.
- Attack!
- Hoo-hoo-hoo. You've said a mouthful.
- Stop. Oh, wait. Hold it. You nitwit.
- Get away, you plant-eater, you. Go on, git.
- I never fought a supervillain before. What do I do?
- It's easy, Stegmutt. Let's pretend Mr. Bushroot is on fire.
- Uh-oh.
[...]