A Smudge on the Azu means that there is an issue with a plan, the smudge being the issue and the Azu being the good idea/plan. It basically means something's a little fucked that was supposed to be great
Yeah, why did Jessica cancel on you for that amazing date you planned? She really put a Smudge on the Azu
Smudge on the Azu means that something great is now a little bit fucked. It could be a plan, an idea, or a situation. The smudge is what fucked it up and the Azu is the original thing.
Dude that sucks Jessica cancelled on that great date you planned. She really put a Smudge on the Azu.