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2.
A phrase usually followed by an especially negative statement. It expresses that the speaker would have no sympathy if the said statement occurred.
Guy 1: Yeah, Oprah is the best daytime show on television
Guy 2: Oprah can burn in a ditch filled with hungry pumas for all I care
by Jaiikke July 31, 2008
 
1.
Meaning that you don't care at all, 'it' doesnt concern you.
A: hey, I heard that when you're dead, your children will sell all your stamp collections on an auction house.
B: When that time comes, they can do with it whatever they like, for all I care.
by axzze January 01, 2009