A phrase used to imitate a person who has just spoken. By saying it at someone, you'll feel and look better than the person you are "correcting".
But the phrase can also be good. Such as, you just finished making something that has never been made before. Then, another person uses assholish sarcasm to comment on your creation. The person insulting you is right to insult you because you didn't seem that excited about your creation.
An example of assholish sarcasm as being used by Person B.
Person A: *just finished making a gun out of paper* "Wow, pretty cool"
Person B: "Yeah it's pretty cool, it's nothing you know. I just finished making a gun out of paper, nothing too fancy you know."
He meets assholes everywhere he goes. — An insult that points to a person who is the personification of the old southern proverb:
“If you meet an asshole in the morning; you just met an asshole! But if you meet assholes everywhere that you go THEN YOU’RE THE ASSHOLE.”
With that statement as axiomatic, by saying “He meets assholes everywhere he goes”, you are using the statement as a verbal deictic and calling the person observed an asshole.
Using “ He meets assholes everywhere he goes” in a sentence:
What a jerk! I’ll bet you that he meets assholes everywhere he goes.
It’s a very direct / indirect insult verging on shade.