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1.
Disown is to refuse to acknowledge a person/being.
To refuse to have ever knowing this person or being.
Jana went out and bought a dime bag.
Mark then disowned her for a year until she went to rehab.
by Joe Yo December 08, 2007
 
2.
What you say to someone who has just said something or done something so completely embarrassing or stupid you wish YOU could go hide under a small bush due to the shame being emitted from said person.
1. John: "Yeah uh so last weekend I went out to town and bought myself a XBOX360."

Me: "Dude...unless you're joking I'm gonna disown all knowledge of ever being your friend, talking to you or even knowing of your SORRY EXISTANCE ON THIS PLANET."

2. Matt: "So I was on WoW'ing the other night and I met this hawt Lvl 60 Night Elf at Ironforge. Yeah at the end of the night I ended up jacking off over webcam for her."

Me: "...disowned."

Matt: "What?"

Me: "You're disowned."

Matt: "Wh..."

Me: "Disowned."

Matt: "Bu..."

Me: "DIS-FUCKING-OWNED!"
by Metalhead For Life November 08, 2006
 
3.
What you should do to any dumbass who goes around saying "owned".
You just got dis-owned you little pwned homos.I just disown -ed YOU.
by loloserz September 07, 2005
 
4.
What you do to anyone who says "OWNED" or "OWN3D" or "pwn3d" or "pawned",etc.
Haha,you stupid little shit fucks just got disOWNED!!!