A person who’s always spewing nonsense, bragging incessantly, and interrupting conversations with their unsolicited verbal diarrhea.
Watch out for that Certified Yapper at the bar. He'll talk your ear off about his “conquests” and job title, but everyone knows he's full of it and lives in his mom's basement
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The saying "certified yapper" means someone who believes they are certified for talking too much/saying dumb shit.
"I consider myself a certified yapper!"
"If I yap too much, then I must be a certified yapper!"