1) You don't care, or you don't know what to do.

2) When you really do care about something but you don't want to hurt anyone's feelings, or make them mad or something.
Boy: "So where do you want to eat?"
Girl: (really wants to eat at "McDonald's") "It doesn't matter".
Boy: "Alright, LET'S GO TO 'BURGER KING'!!!!"
Girl: (I was hoping that we could go to "McDonald's", but...ah, it's fine)
by kue serabi September 16, 2017
Polite thing to say when you've accidentally revealed something that's bothering you.

Used so the other person forgets about it and doesn't worry.
Person 1 - Ah, yesterday was horrible.
Person 2 - Why? What happened?
Person 1 - It doesn't matter.

Person 2 - Cool, I'm going for some chips.
by Milonima October 26, 2014
Person 1: the sun will explode everything we do it pointless
Person 2: yeah it doesn't matter
Person 3: OK welp that's sad
by OK, why? June 9, 2020
Girl's definition: something that really does matter to them but they don't want to bother you with the issue.

James: How are you today
Cheyenne: It doesn't matter *sighs*
James: come on, yes it does
Cheyenne: no it doesn't... *looks down sad*
James: It's important, come on tell me
Cheyenne: Depressed
James: How are you today
Cheyenne: It doesn't matter *sighs*
James: come on, yes it does
Cheyenne: no it doesn't... *looks down sad*
James: It's important, come on tell me
Cheyenne: Depressed
by <3boo<3 November 30, 2014
A phrase that does no good for Mr. Puniverse. If he were smart he'd have a phrase saying it's better to be small.
New phrase "Quality not Quantity" meaning being a monster with a small penis rather than a wimp with a big one.
by IcyHaku December 2, 2004
a myth perpetuated by 2 groups:

1)men with short penis'

2)women married to men with short penis' , women, that is, who don't want their guy to feel inadequate
Nancii said that size doesn't matter, but she also has said that she prefers a thick stiff one, good and far up inside her.
by Jake March 24, 2004
what guys with small dicks say.
jeff: size doesn't matter

liam: you're only saying that because you have a little cock.
by your mother's mother October 29, 2014