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F-MEGA is like F but way stronger. It's for when you're so obsessed with JoJo that you think you're better than everyone else and you swear on your life.
Bro, I got F-MEGA because I beat your JoJo game in 3 minutes.
I F-MEGA'd my cousin because he didn't know what F-Origin was.
I F-MEGA'd my teacher when she said JoJo wasn't real.