CommentStreams:Ae25fc6c24d9eba05493f7ef7950be2c
From The Lost Media Wiki
Two things I'd like to point out in regards to the episode you're looking for.
Firstly, I think the episode you're looking for is called "When You've Got to Go!". Secondly, I recall the episode being a HUGE favorite among creators of YouTube Poops, as I've noticed several YouTube Poops of the episode floating around; they would have to have gotten the episode somewhere to be able to make a YouTube Poop of it, so the episode itself might still be out there, likely on a (possibly out-of-print) VHS or DVD release.