Mantisboi Share definition Flag An awesome my singing monsters YouTube with a fanbase mostly consisting of toxic fanboys and fangirls and brain-dead toddlers Damn it mantisboi! Quit being a shit eating fuckbag and fix your fucked up community! Mantisboi by TotalRandomness62 July 15, 2020 0 0 Get merch Get the Mantisboi mug. Buy Now — $32.95 See more merch