3D Fauna Yapping that her enemy is Cheating | 『Hololive』 

So true!

Prove it by licking them

Last green lady standing

Tack on an "(affectionate)" at the end there and I think you've pretty much got the "new slang" definition down. There's definitely an implication of "blah blah blah yadda yadda yap yap yappity yap" but in a cute/endearing way rather than being annoying. Like playful, aimless, meandering banter

Yes and no, it does mean annoying sort of useless rambling about nothing. But it’s started to be used somewhat in an ironic/endearing way for streamers since streaming is a lot of talking about nothing a lot of the time.

@@dutchpotato3557 ahhh this makes sense, it's a streamer culture thing, I basically only watch Hololive for streamers, I've been pretty out of touch there

Nah it's not just streamer culture, it's being used wrong like you're saying as well.

​@@VBandit47Words change over time. We had lit, let the younger generation have slangs of their own.