Yapping is talking lots and lots and lots, like reneé rapp in the bridge of her single "talk too much":
Okay, having said all that
Do you still wanna be with me?
'Cause, like, I wanna be with you
Like, like, maybe even forever
Holy shit, okay, maybe not forever
I mean, like, I'm, I'm not saying not forever
I, I actually have no idea what I'm saying
Are you mad at me?
'Cause, 'cause it's cool if you are
Right? Like, I don't care
But like, if, if you are then I'm gonna resent you
Okay? I'll forgive you but
I'm just wondering, like, okay, like, is this a sign?
Do I actually hate you?
I, I just wanna be honest, right?
Like, do you still love me?
Me: Hey bro, what does yapping mean?
Bro: Oh, I'm so glad you asked!! So yapping is basically, so basically it's like where you just talk on and on for ages in great depth without stopping. Like in reneé rapp's song, talk too much. She talks a lot in the bridge and we could call that yapping because she just goes on and on and on and on and on.