From the Urban Dictionary:
Lucy, you got some ‘splainin’ to do!
Saying a person or entity “has some ‘splainin’ to do” (in a Cuban accent) is a humorous way of suggesting that they have done something illegal or otherwise embarrassing.

The catchphrase dates back to the 50’s “I Love Lucy” show.
“Dude, asdfghjkl;!!!… why are my briefs pink?? Lucy, you got some ‘splainin’ to do!”

In this reality the line was never said on the show.

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