Thugosaurus rex Share definition Flag An overly large or muscular (or both) 'Gangster' or 'Thug'. Usually of African American descent. "Dude, did you just see that huge black guy in there?!""Yeah, he's a straight up Thugosaurus rex!" Thugosaurus rex by Captain Testosterone April 22, 2010 Get the Thugosaurus rex mug.