What it means
Someone who talks excessively, often about nothing in particular, non-stop chatter, rambling, or over-explaining things nobody asked about. Being called a “yapper” means you just don’t know when to stop talking.
“Yap” has long meant idle chatter, but “yapper” exploded through TikTok around 2023-2024, especially through the “yapper” personality trend, videos mocking people (often affectionately) who dominate conversations or ramble in voice notes.