To make an obviously false claim.

To attempt discussion on a topic with no prior knowledge of it usually results in this.
The moon landing was a hoax? You're talking out of your ass.
by oobymach June 21, 2012
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When someone says something stupid that they have no proof of. For example, "The Space Shuttle was destroyed by TERRORISTS!"
by Legato February 18, 2003
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Uttering bullshit or talking nonsense. Most commonly done by managers and corporate whores.
Employee: Will you make some sense and stop talking out of your ass?

Management: YOU'RE FIRED!!!
by AYB February 19, 2003
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Talking out of your ass, also commonly known as verbal diarrhoea. Is typically performed by closed minded idiots who like to state their opinion on a topic, having no prior information or evidence before discussion.
Grandparent: "Downloading and printing are the same thing!"

Grandchild: "No they are not, you don't even use the internet. You are talking out of your ass, stop living in a 1960's dream world".
by Alfred Pistachio April 22, 2016
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A person that talks just to hear there self talk.
U sound better talking out of ur mouth not ur ass.
by cartman5000 July 25, 2004
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Claiming something that’s not true.
1
James: I’m from da hood my nigga.
Jamal: you’re from da burbs, stop talking out of your ass.

2
Keisha: you’re a sellout and a self hater because you’re black yet your wife is Hispanic.
Deon: that’s not even remotely true, you’re talking out of your ass, Keisha.
by nutella137 December 30, 2021
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Speaking on a topic you know nothing about.
Politics? Again? You need to quit talking out of your ass. You don't even know who the President is!
by LizzyBlitz April 4, 2014
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