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1.
When you don't want to listen to someone's conversation, or hear what they have to say. When you could care much much less about what they have to say.
Person A: PENGUIN LOVE ! :D
Person B: I don't care what you have to say. It is random and unnecessary.
by aman207 December 12, 2011
 
2.
Derived from one of the 3 values used in digital technics: 0,1, dontcare

Use it when someone shares any information but you're not interested. If you want them to shut up or switch the case in a smooth way just say: Dontcare
- Hey I've just bought a pimped 78's Camaro yesterday!
- Dontcare!
by ks196 April 10, 2006
 
3.
Another name for shoulder shrugs whilst working out.
Haha, when you're lifting doing shoulder shrugs it just looks like you don't care. Let's go do some don't cares.
by Jay-Osh June 21, 2012
 
4.
A rare form or honesty that can't be taken by any and everyone. When you basically just get to the point and say you not giving a fuck about whatever it is a person is saying.
"So what I wanted to tell you is, I think I'm in lo----"

(Cuts her off) "Don't Care." (Walking away is optional)
by Swear4 July 29, 2014
 
5.
don't care means that you do care but you just don't want to tell them that you do
girl:hey do u think i should ask jake out?
boy who likes girl:i don't care...
by lovealex710 July 10, 2008