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1.
When an attempt to insult someone (or pwn them) backfires and results in self-humiliation.
<PersonA> eat my fucking shit
<PersonB> I would but I'm too busy suckin yo daddeh's cock
<PersonA> ....
<PersonB> er, wait..
<PersonC> self-pwn
<PersonB> fuck
by Snake0 June 12, 2007
 
2.
1: When you do something utterly stupid, it causes something bad to happen to you

2: suicide

3: Variation of self-own
Guy 1: He slipped on his skateboard and fell down the stairs, breaking his neck.

Guy 2: Self-PWNED!
by Tacosniffer May 12, 2006
 
3.
when one humiliates themselves to thepoint point of being pwned
Yo whats up with that kid during class, he is always making stupid comments and self-pwning himslef.
by coopertrooper March 17, 2011
 
4.
To pwn oneself
>>And then I said, "I thought you had a girlfriend?"

/facepalm, selfpwnd tbh<<
by Zerazar September 14, 2008
 
5.
It is the act of hurting or destroying oneself in computer games without any positive outcome. First used by Kaycee, of clan dHz(Half-life), Malaysia when she blew up her own satchel charge while forgetting it was nearby.
You just selfpwned.
rofl that was a selfpwn.
by iicaie August 26, 2008