shoot your mouth off
US /ʃuːt jʊər maʊθ ɔːf/
UK /ʃuːt jʊər maʊθ ɔːf/

1.
puszczać parę z ust, gadać za dużo
to talk too much, especially in a boastful or indiscreet way
:
•
He tends to shoot his mouth off after a few drinks.
Ma tendencję do puszczania pary z ust po kilku drinkach.
•
Don't shoot your mouth off about the surprise party.
Nie puszczaj pary z ust na temat imprezy niespodzianki.