Elephus Maximus is generally a term used to describe a very large human being. It can be used as both an adjective, and a noun. The term has become so popular that there is even a song named after it.
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Tim: Have you heard of those "Elephus Maximus" creatures?
Bob: Yeah, one of them sat on my granfather and killed him
Tim: rip, dying to 36000+ pounds is a bad way to die