Top definition
When you are dehydrated and as a result sometimes form a crusty white pastey substance around your mouth.
Ryan went for a jog today, and when he came back he had Cum Mouth. I didn't tell him to save him the embarrassment.
by XSpence January 07, 2009
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2
cummouth is what certain people have when they try talking shit about one person

but then they go and suck on their dick (kiss their ass) behind your back .
they don't have to be physically sucking their dick to be accused of it
just metaphorically.
(all though that would be funny)

(it can also be a thing you can say randomly to your non gay friends)
(just to scare them tbh)
"ha yeah, brad sucks. hes such a asshole"

"bitch stfu, i know you got cummouth"
by bigtiny May 12, 2020
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