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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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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
(Jane walks out of the house with tie dye knee-high socks. Friend Lily is taken aback)
Lily: Whoa, hippies de mayo
by the hott one May 29, 2005
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3
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 26, 2008
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