0 to talk too much in a loud and uncontrolled way:
It's just like Richard to go shooting his mouth off about other people's business.
1 infml to talk too much about things other people should not know:
Don't go shooting your mouth off about how much money you earn.
NOVÉ SLOVÁ
European
May 10, 2021
SLOVO DŇA
Shimmer
shoot your mouth off