Forum:Trying to find an episode, don't know the name

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Alright, so let me start this off by saying that I can't remember where I read this, and there's every chance I misread it because it was probably fairly late, and I was more than likely half-passing out.

Somewhere along the line though, I read about an episode where Finn and Jake encounter an abandoned baby of some sort, and the parents don't want it back. Finn also supposedly starts freaking out, yelling something like "Mama's supposed to love baby!" it was mentioned in conjuction with the Boom Boom Mountain episode, probably on a topic pertaining to Finn's childhood or possible abandonment issues.

Either way, I can't find the damn episode. I'm gonna feel like a total idiot if its right on this site somewhere, which it probably is. Alternately, if it doesn't exist, then I'll feel reaaally stupid for misreading something.