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1.
A genre of independent films in which the characters are involved in a personal crisis. Known for their realistic point of veiw, these movies are the eyes of the just-out-of-college generation.
Billy: Hey Sally, have you seen Mutual Appreciation yet?
Sally: Uhm...I've never even heard of that...
Billy: It's totally mumblecore, you'll love it.
by hudgoesplatt92 May 22, 2008
 
2.
a group of filmmakers who make performance-based films that focus on the everyday problems, often about relationships, of middle-class twentysomethings.
"I just wasted 2 hours of my life watching the mumblecore film, Mutual Appreciation."

by robottt July 22, 2007
 
3.
a new amateur film movement. Some movies have bad sound quality thus people sound like they are mumbling. Low budget production. Popularized by a director from the SXSW Film Festival.
My low budget production is a mumble core?
by Todd Lorbecki December 26, 2007