Peeling Paint joke..........?

When I was younger I did not get that joke in Mulan 2 about "peeling you paint". I was like "paint is hard to remove from walls; maybe it it not actual paint.". I thought it might be maybe the skins on onions. Today, I think "why not make it into a joke": "Your breath smells so bad that you peel onions :D" *NOT to be used as an insult. Has anyone thought of this?