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1.
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
9 4
 
2.
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
0 3
 
3.
synonym for much or a lot
(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
2 6