Asking my 14 year old what sybau means?

Asking my 14 year old what sybau means? What does sybau mean? It's spelled S-Y-B-A-U. No, no, uh-uh. You mean S-Y-B-A-U? Uh-huh. It means shut up. Do you be saying that? No. You using your lying voice. No I'm not. I'm not using that, I swear. Okay well you know how I told you your tongue get heavy when you lie. I'm not lying, I swear. You sure look like you lying. No, cause like, you hit me with the like, my own, like, my own generation's slang. But I don't use it. It's that picture of that one guy. And he like, shut up. And it's like a, a heartbeat. People be saying that like, they be putting it, and they be like saying shut up. That's what it mean. That's you don't say it. No, I don't. So if I, if I look through your text messages, I ain't going to see nothing where you said it. No, they actually do not. All right.