What's the joke about cheetoh stains

When I was super young our neighbor came over and told my dad a dirty joke. He wouldn't tell me at the time what the joke meant and said when I'm older.

I asked him 18 years later (lol) and he had no idea what joke I was talking about.

I don't remember the joke at all but it had to do with something cheetoh stains behind his ear or something?

Any ideas what it was?

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