The name for the people belonging in the Teenage Mutant Ninja Turtles fandom. They're all frackin' awesome. Yeah.
Person 1: ..And then, Raphael was all like "IT'S FREAKIN ME OUT, MAN" and Donatello was like "WOULD YOU STOP WITH THE THIS" and then--

Person 2: You're one of those shell heads, aren't you?
by Nikkimberly November 04, 2013
A nickname for Marvel's Iron Man.
Stan Lee: Spider-Man was Spidey, Captain America was Wing Head, Thor was Goldilocks. I loved calling Iron Man Shell-Head and Daredevil was Horn-Head.
by Run Like the Wind November 23, 2013

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