To royally screw something up.

See Epic Failure
Boy! He really DeMelloed that one, didn't he?
by JustUsChickens2 August 2, 2008
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Demello is a very sweet guy ! He is usually shy when you first meet him but once you get to know him he is outgoing ! He can sometimes be distant but that is okay ! He will usually be found playing sport and wearing an addidas tracksuit, demello loves girls and the girls secretly love him
Girl 1 : "omg did you see demello he is so cute"

Girl 2 : "yeah but he is so shy"
by Annonnymoss1234 June 11, 2019
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{v} One who did something completely stupid and dumb. A dumb action. To act in a way that makes one appear simple. To use absolutely no common sense. To ask a question which has clearly been previously answered.
Person A: I zipped up my pants and caught my ball sac in the zipper.
Person B: Dude, you just Demelloed!

Guy 1: So I learned how to do burnouts last week! Its so cool!
Guy 2: Nice man! I bet you get the pussy with that!
Guy 1: Yea dude, it's sweet....but I can't figure out why my car is starting to break.
Guy 3 (to Guy 4): Dude, he just demelloed!
by one88888 August 5, 2008
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