To screw up something that is a for sure thing.
Man... I was about to nail this chick, but then i demayoed it in the end.

I thought I did good on the test, but I ended up demayoing it.
by Shawn J. K. March 23, 2008
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Brian demayos head can be used as a mirror.he smells like ciggerets all the fucking time
He thinks he is big and bad but his white cracker ass is not.he gave me 2 days of mip just for cussing. I'm sure that he is adopted. fuck demayos bitch ass

Fuck Perryville high school.-aaron
Brian demayo is a pussy
by Lilwumppp November 16, 2019
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some who doesnt bathe for five days
That crusty fuck pulled another Stinko demayo now he really smells
by mark6 December 15, 2011
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The full name of popular character "Steven Universe" from the show of the same name & "Steven Universe: Future"
A: hey, what's steven universe's full name?
B: It's Steven Quartz Cutie Pie Demayo Diamond Universe. idiot.
by Quackiduck July 14, 2023
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To blow something that is virtually guaranteed, usually due to your own hubris
Satan was once known as lucifer, but he demayoed his rebellion and wound up stuck in hell.
by Mister F March 27, 2008
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Demayo is a pretty girl , who does not lack confidence and it not afraid to say and do what she needs to do. She is smart and a bit of a dare devil.
by abimisola March 7, 2022
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