The improper use of an acronym, whereby the last term is repeated in its full form for some unknown reason.
Person 1: Is there an ATM machine around? I have a new PIN number I want to try out.

Person 2: Nice redundonym, jerk. I think there is an Automatic Teller Machine Machine around the corner. Hope the new Personal Identification Number Number works.
by jrs1 December 17, 2010

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