bantasaurousrex Share definition Flag An absolute legend who is the funniest guy in a group of people who THINK they're funny, but they're not the true apex predator. Hey, that dude called Sushi is a bantasaurousrex - truth be told he DID invent the word bantasaurousrex by Whoisthere? April 26, 2022 Get the bantasaurousrex mug.