A person that is identified as a criminal and tries to claim innocence, would likely try to talk about how they were not guilty.
"Bro i swear to god i didn't steal that guy's underwear"
"Stfu Criminal Yapper"
A yapper who´s indentified as a criminal, likely is trying to talk about how he´s not guilty about the stuff he did
"Bro i swear to god i didn´t steal his vapes."
"Stfu criminal yapper"