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1.
To underestimate someone to such a ridiculous degree that when they retaliate and crash all of your servers you know that it was because of you that this happened.

Commonly used in the PWE game Forsaken World. First used by the hacker vpxsyngexvpx who single-handedly took down the Storm Legion server with a team of 3 people.
Ok No Problem. US Servers Is Going Down Again Now. Cuz You Sebestimated Me.
by vpxsyngexvpx March 25, 2011
 
2.
To disturb, distrupt or abuse someone or something.
Or be-little (underestimate)
You Sebestimated me!
That is completely Subestimated.
Lets Subestimate people.
by SirLooney15 March 25, 2011