talk to the ass!

A gritty manner of telling someone you don’t give a flying shit about what they’re saying to you.

Implying the person is lying or spreading bullshit, so you tell them to shut the actual fuck up.

When the substance of what your saying is so unimportant that if someone did not hear you, and they asked you to say it again, you would tell them "oh, no i'm just talking out my ass"

Talking Out Your Ass-
It's when someone begins to speak or writing on face book before they know the truth, irregardless how it might make others feel. Sometimes when the truth is then explained to them, they twist what you say and speak even louder out the same orifice. We are all susceptible to this terrible condition wether we admit it or not and If left untreated it can lead to a complete break down in communication, alienation, loneliness, severe depression, and anxiety which worsens the condition. But if caught in time can be treated properly with truth and logic can be completely avoided and leave practically no ill side effects. Even with proper treatment occasional flare-ups should be expected. Laughter is also always a good antidote.

the act of talking out of one's ass, often of things that are nonsensical

To make an obviously false claim.

To attempt discussion on a topic with no prior knowledge of it usually results in this.

to act like you know what you're talking about when you really have no clue