blabbermouth

noun3

1. •
   (informal, disapproving) A gossip.

   • If it weren't for that blabbermouth Sally, the principal would never have known we did it.
2. •
   (informal, disapproving) A person who talks excessively.
3. •
   A kind of foam-dispensing nozzle used in firefighting at airports.

   • Two handlines are capable of 240 gpm and an undertruck "blabbermouth" nozzle can sweep the ground ahead at 240 gpm. — 1964