Autism macros are memetic abominations shat out of 4chan's /jp/ board. The goal here is to parody internet arguments and insults in an over-the-top and grammatically atrocious way. The images have since spread to other boards like /v/ and /a/. It's not uncommon to see retards actually take these images seriously and write replies to them.....usually of the type you see in the images themselves.
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