mouth
1. A person who talks too much and tells everybody's business. Secret leaker

2. A person who talks trash 

3. An unexpected guest for dinner.
1. "I don't know how everyone knows I only told one person."
 "yeah but that one person you told was a mouth"

2. Mouth got his a$$ kicked at the club last night.

3. "I only made enough for US, I didn't know we were going to have a mouth"