Apparently, people are reusing the old work ‘yap’ in a new internet way:
In the internet context, I would say somebody that’s a yapper is somebody that talks too much or is an over-sharer. Somebody that just keeps on talking to fill the air. If it gets quiet, they just don’t stop talking.
| Taylor-Nicole Limas, ‘a 27-year-old influencer and self-proclaimed yapper in Chicago’, according to Madison Malone Kircher.
Merriam-Webster defines ‘yap’ old school, like this:
yap
1 of 2
yapped; yapping
1: to talk in a shrill insistent way : CHATTER
2: to bark snappishly : YELP
yapper noun
yap
2 of 2
1a: a quick sharp bark : YELP
1b: shrill insistent talk : CHATTER
2: an unsophisticated, ignorant, or uncouth person : BUMPKIN
3 slang : MOUTH