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1.
A phrase used to describe complete lack of interest in what another person is saying, considered rude or necessary, depending on the conversation.
Alternatively, this can be used as a defensive phrase, see examples, to attempt to save one's self from ridicule.
As a third option, it is also used as a peacemaking, forgiving phrase.
Rude-
Josh: My grandfather passed away this morning.
Jake: So what?

Necessary:
Josh: Oh my god, I think my shoelace is coming undone!!!!111oneone!!!
Jake: ...so what?

Defensive:
Josh: You're an ass, man.
Jake: So what?

Forgiving:
Josh: I'm sorry I called you an ass.
Jake: Forget about it, man. So what?
by SoManyGoodness February 23, 2010
43 2
 
2.
showing an air of indifference; nonchalant; devil-may-care.
Do not harbour a so-what attitude. Be serious.
by uttam maharjan July 10, 2011
2 4
 
3.
Gangsta slang for "what's up"?
"Hi, godfather."

"Sow hats up?"
by randomcuriosity February 01, 2008
1 7
 
4.
a phrase used by mentally retarded people, after every sentence they say.
"i had a little vodka, so what?"

"so i wasted billions of dollars sleeping through the space mission, so what?"

"another unsuccessful, so what?"

"i made a protein shake at 6 in the morning, so what?"
by MBul August 10, 2006
36 93