Calling someone a not very bright vagina, or just a dumb cunt.
Your are such a cumdunt, i can't believe you couldn't figure that out.
by Rusty Bedsprings November 26, 2005
Reversing the first letters of two words, Dumb and Cunts, whilst screwing it up entirely with a play on words to describe stupid women doing something stupid.
"You see those girls twerking over there? Typical Cum Dunts"
by WarheD September 04, 2013