The act a person commits when they are thinking about something and begin talking out loud to themselves about it. Similar to 'thinking it over.'
Man: Is she talking to us?
Woman: Nah, she just got in a fight and now she's mumbling it over.
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To show one's age. When an older person makes a comment or action that refers back to times long since past and shows just how old they are, generally alienating the younger generation a bit in the process.
My grandfather made a reference to Howdy Doody today. Man, was he showing the horse and cart.
Also showing your age
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