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A Facebook Stunna is someone who yells about kicking your ass online but would cry if you walked up to them. They're too scared to look like a coward in front of their fake friends.
'I'm gonna beat you up at lunch!', then he ran when I flicked his forehead.
'I'll end you in the gym!', he didn't even show up to the gym that day.
'I'm gonna beat you at the video game!', he lost in 3 minutes and quit.