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Synonim for something that went wrong or is messed up. Something that is fucked.
When you get a virus on your computer, you can say that your computer is deefed.

There are various alterations to the word. You can simply say for example, "Computer deefed," when you need to say that you're computer is fucked.

Originated in Allentown, PA.
by Robbit August 10, 2005
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2
Defriended. On a social network, or in real life, removing someone from your "friends list".
"John kept making racist jokes, so I deefed him."
by justfred November 21, 2013
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3
1.to pwn a massive un-healthy amout of food
2. to do something almost as stupid or as stupid as someone who is mentally retarded
3. for a human to have the size of an elephant head
4. to run/to hills all summer
5.To not be able to afford something of inexpensive value.
1. Wow that dude just deefed that family sized lasagna.
2. Holy crap did you see that deefed up head, no way he'll find a fitted.
3. Yo you justed deefed that hill, your fast and in shape.
4. Man be real, quit deefing around about how you were fuck buddies all summer.
by ddub September 04, 2008
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