Some guy farts and says, "That was some asshole behind me."
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Explanation
The humor comes from the guy blaming someone else for his fart, implying that the 'asshole' is a person behind him, when in reality, the fart came from his own 'asshole'. It's a funny play on words.
Teresa
I've heard it this way: When you hear someone fart you say "hey, there's some asshole talking shit behind your back" lol