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Gum Bumpin

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)
Gum Bumpin by JVRAS August 6, 2011
Related Words

Gumbumpin 

Getting a blowjob from someone without teeth.
That granny Smith over yonder sure good at gumbumpin.
Gumbumpin by Maddog936 August 8, 2018

gumbumpin' 

Slang for eating; originated from watching old people eat food without their dentures.
That home made banana pudding was some good gumbumpin'!
gumbumpin' by Apexer August 7, 2009