My favorite songs to sing as a kid were the ones where I could randomly scream something. This particular song didn't originally have a lyric to shout, but my siblings and I though it was funnier. I also didn't learn the rest of the lyrics until I was older so everyone was stuck with me just repeating this part over and over. Which is what my nephews and nieces do now when they like a song.
This is the song here: Ma, He's Making Eyes At Me (this isn't the version I know, but since the song was written in 1921, I wouldn't worry about it)