I don't care; don't bother; piss off. Originated in IRC conversations, as an offhanded direction to leave the current channel and cry to the channel where people care.

"#care", a term apparently first used by _mockingbird_ means "don't care" or "I don't bother". No one knows where the slang first originated from. It's adoption is not yet widespread, but more people seem to be picking it up.
Suggestions that "#care" refers to a real or non-existing IRC channel have been denied.
Notice that, often, "#care" is used by itself, use of a personal pronoun like in "I #care" has never been seen.

To express no care in the slightest in what the person is saying and/or doing.

1.) adjective: compassionate, warm-hearted, loving.
2.) adjective: tenderly concerned and helpful
3.) adjective: affectionate
4.) idea: kindness, sympathy, understanding

Means you don't give a flip about what someone said previously.

Used a lot in chat rooms especially OTS channel on battle.net servers.