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4.
Talking shit is saying something that isn't true, or that is wrong and it's usually done behind someones back.
"Person 1": That g is fuckin ugly.
"Person 2": No she ain't, stop talking shit just 'cuz you couldn't get her.

Example 2
"Girl": How you gonna act all fine with me and then talk shit about me as soon as I leave?
"Guy": How was I talking shit about you?
by RILIL2 March 26, 2008
 
1.
1. Just bull shitting around with words and saying crap you dont really mean.

2. Insulting someone.
1. Jeff: Man ima marry queen elizabeth, she's a milf!
Ted: Quit talkin shit man.

2. Jeff: Ted you suck so much that David Oreck is having a tough time outmatching you!
Ted: Fuck you bitch.
by Oz February 28, 2005
 
2.
The process of talking behind someone's back about them.
"She was talking shit about me at the party"
by your mom March 10, 2003
 
3.
when someone says unneccessary shit about someone behind their back
justin was talking shit to michael about how kelli doesnt need a winter coat, shes fat enough to keep herself warm
by kelli fucking hennessy December 03, 2007
 
5.
Saying something (usually mean) about someone, and when confronted straight up denying - and even saying the opposite of what you had said.
Shelby: OhhEMMMGEEE Helga is such a whore!
Anne: Really?!

***5 minutes later***
Anne: Shelby is Talking Shit about you
Helga: What?!

***10 minutes later***

Helga: So I'm a whore?
Shelby: What? Who said that? That is so mean! I can't believe anyone would call you that!
by MyDefinitionisCorrect November 18, 2010
 
6.
To express negative opinions of nonsense about any matter (person, object, etc.)

As I always say : Don't talk more shit than you can eat
A : "Computers are bullshit"
B : "Stop talking shit just because you don't know how to use them"
by Richard T. Meddy January 04, 2008
 
7.
saying bad things about something or somebody.
why are they talking-shit about me?
by Paco Rivera March 16, 2005