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When your granny takes out er TEETH! (dentures) and gives a young man with a cock a blow job. AKA grammy gum job.
old lady walks into my room and she gets horny and pulls her dentures out and un-zipz my pants and starts deep throatin' and swallowing my cum. boys and girls, that's what a GRAMMY GUM JOB is!
by JR. MCLOVIN' June 08, 2010
Happy St. Patties Day!