Top definition
Someone who isn't the brightest. One could even say they have a gap between their ears. They are essentially the opposite of a smart cookie.
Carol: My sister is pregnant and I can't wait for the gender reveal. It's so exciting to find out if I'm going to be an aunt or uncle.

Carl: Oh Carol, you are a dumb donut!
by Sheepherder37 June 04, 2020
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Sep 11 Word of the Day
when you're hungover as shit after a spending a night drunk as a skunk
I'm hungover as a duck let's go get some grub
by pokeythepony June 25, 2021
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2
a slut who cheats. See "Spare me the Details" by The Offspring.
She's a dumb donut, I can't believe she dit that behind your back.
by Nick June 04, 2004
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