When a person with no teeth attempts to bite or 'gum' on a nipple, often for sexual purposes.
I would have went to that site if they we're hot, but I don't need to see ruthless toothless gummin' up some nip.

I would love to just bite on a nip but my dentures always fall out and I wind up gummin' up some nip.
by SirGatorFalls October 17, 2016
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