Herbivore Boy Share definition Flag Japanese slang for a feminine boy. Kind of like a metro guy who is quiet and sensitive. "He is so kawaii in his pink mickey mouse shirt and styled hair!" "He is a herbivore boy" Herbivore Boy by hollyyyyyyyylylyly April 4, 2010 0 0 Get merch Get the Herbivore Boy mug. Buy Now — $32.95 See more merch