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1.
Short for "demolished." To be absolutely obliterated in against an overwhelmingly stonger competitor. See pumped.
Guy #1: "Man our team lost 15-4"

Guy #2: "wow, you guys got demo'd"
by Cecil B. Demented December 29, 2004
 
2.
Altering the moderator into a member
Hey, you heard about what happened last night?

No, what?

John had been demodded!
by Kelly February 19, 2005
 
3.
When you have to get rid of something demonic.
that pizza was rank and so it was Demo'd.
by kimmmmaaaayyyy June 01, 2009
 
4.
to get absolutely hammered.
yo bro...wanna go get demo'd?
by BP 2.0 November 02, 2008