To be changed from new to old.
OMG! Mum that bra is Grannified!
by James And Nathan February 26, 2005
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to appear old or appropriate for an old person
Jane endeared herself to Mike's grandma by grannifying herself: she let her boobs sag a little, took up tea drinking instead of her usual Bud Light, and drove her mother's Grand Marquis to the house.
by grcosta August 12, 2010
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