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A kid who's too old to be cool but too young to be a real boomer. They're usually using the word because you're giving them grief or talking trash about your generation or your dumb self.
'You're an e boomer, I've seen older people with better fashion sense than you.'
'You called me an e boomer in front of my mom, I'm gonna tell your dad about that.'
'You said I'm an e boomer, but I have 100 more Instagram followers than you.'