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1.
when someone gets self-owned means that the reason of ownage aren't the owning guy's abilities/skills/etc. but the owned guy's stupidity/lack of skills or abilities/etc.

basically said, someone gets self-owned because he does something stupid

who owned him isn't extraordinary, but the owned guy himself is worse than others

similar to selfd
table tennis player 1: (trying to hit the incoming ball while actually hitting the table, dropping the bat and screaming)

table tennis player 2: "haha so self-owned"
by forceNet June 28, 2007
 
2.
The word is pretty obvious. If you own yourself.
It's actually making a comment that makes yourself look stupid.
Usually used on forums.
Yesterday I forgot my girlfriend's name, and she dumped me.
Reply:
Oh my God, that's so self-owned
by King Alcohol May 12, 2006