Top Definition
an extremely fat chick (can be a guy) who is legally morbidly obese and is fatter than a tricerahorn and bihorn. A really really really fat person
"HOLY MOTHER OF PEARL! THAT BITCH ON TV IS A TYRANAHORN, TO THE MAX!!!"--"Yeah, dude. She covers the entire 60 inch screen."
by The Master Beta January 18, 2006

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