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1.
v. To thoroughly demolish someone in a spectacularly gruesome way. "Ruining one's shit" goes far beyond simple pwning.
1. That bastich mouthed off one too many times, so Lobo came and ruined his shit.

2. That 2000-lb bomb totally ruined that Iraqi's shit.
by Spongebutt Squishpants August 24, 2004
 
2.
A term used by Maddox on maddox.xmission.com. Means to "fuck up" or "eradicate" something.
Man, This band totally ruins your shit and stomps your colon
by iwannabeanalcoholic January 22, 2005