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Packing a hammer is when you jam a big wad of snuff so deep between your lip and gums it feels like your mouth is getting a wedgie.
My grandpa packs a hammer so hard, his face turns purple and he starts cussing the whole town.
I packed a hammer so tight, my dog walked up to me and said 'you look like a soggy biscuit.'
She packed a hammer so fierce, the snuff nearly bit her tongue.