Top Definition
A superhero you will find on 'The Simpsons' Bart and Mill house are great fans of Radioactive man. He is somewhat like superman! he wears bright red clothes and a cap
"Is it a plane? is it a bird? no its RADIOACTIVE MAN"
"Bart: where can i get the first ever issue of Radioactive man?"
by Mr T April 12, 2004

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