To speak of something you know nothing about. To spread rumors, gossip, or speculate without all of the facts. See also (Trash Talking) (gossiping). (hating)
I wasn't even there, see Joe's gum bumpin again!
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bumpin gums is talking shit about someone
man i heard you were bumpin gums you need to quit that shit
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A blowjob.
She's got that mouth that makes me wanna be bumpin gums if you know what I mean.
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She and that dude been bumpin' gums over at the likker store.
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Chopin it up. Discussin' a lil sumpin sumpin.
Me and her were bumpin' gums bout dat new ride dat boy got.
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A conversation with no substance or general meaning
Elaine: i bet there talking about me
Kramer: oh please there just bumpin gums