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2.
A blowjob.
She's got that mouth that makes me wanna be bumpin gums if you know what I mean.
by Youredoingitwrong November 14, 2013
 
1.
bumpin gums is talking shit about someone
man i heard you were bumpin gums you need to quit that shit
by brad paul October 15, 2005
 
3.
talking
She and that dude been bumpin' gums over at the likker store.
by irehs February 17, 2009
 
4.
Chopin it up. Discussin' a lil sumpin sumpin.
Me and her were bumpin' gums bout dat new ride dat boy got.
by TXNinSingapore February 17, 2009