Homo Idioticus Share definition Flag A split group of Homo Sapiens that have evolved to have up to 80% less brain matter, thus greatly decreasing intelligence. Bob: "How could Carl possibly be that dumb?" Jake: "I think he is a Homo Idioticus." Homo Idioticus by Jimothy A. Bonquavious April 7, 2022 Get the Homo Idioticus mug.