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".
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