Say a mouthful
Meaning: to say something of a significant or shocking, to say more than one should
Example: John pushed his way in to the party and confronted Laura. He began to rant and rave and say things everyone knew he would later regret. He said a mouthful.
Example: John pushed his way in to the party and confronted Laura. He began to rant and rave and say things everyone knew he would later regret. He said a mouthful.