Dirty hobo

So, when Baby R tries to get out of taking a bath I tell him, "You smell like a dirty hobo. You need a bath, kid!"

So, recently, he very seriously says, "Mommy, smell my armpits. Do I smell like a dirty hobo?"

Am I wrong for laughing at this? I mean, come on...that is kinda funny. It's not like I'm laughing at a curse word.

So, I very seriously answered back with, "Yep, you're a hobo. A dirty one. Ew."

*giggle*