na-na na-na boo-boo
A teasing nonsense phrase typically said by children. You can't catch me! Na-na na-na boo-boo!
boo-boo
1. A minor blunder, error, or mistake. I think you made a boo-boo and listed some of the expenses twice.
2. A very minor injury. Let me put a Band-Aid on your boo-boo, sweetheart.