let rip

/L EH1 T R IH0 P/
verb
  1. 1

    To unleash, let loose, uncork

    โ€œHe let rip a fart that emptied the elevator at the next floor.โ€

  2. 2

    (usually with a prepositional phrase) To utter or release without restraint.

    โ€œShe let rip about Mary's flirting with Lizzie's boyfriend.โ€

Source: https://en.wiktionary.org/wiki/let%20rip