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
<PersonB> er, wait..
1: When you do something utterly stupid, it causes something bad to happen to you
3: Variation of self-own
Guy 1: He slipped on his skateboard and fell down the stairs, breaking his neck.
Guy 2: Self-PWNED!
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.