Verb
(transitive, informal) To unleash, let loose, uncork; to allow (something) to happen or proceed without restraint.
When she heard the news, she let rip a tirade heard throughout the office.
Ok, it's all clear. Let 'er rip.
He let rip a fart that emptied the elevator at the next floor.
(intransitive, usually with a prepositional phrase) To utter or release without restraint.
She let rip with a tirade everyone heard.
She let rip about Mary's flirting with Lizzie's boyfriend.
(intransitive, slang) To fart.
Source: en.wiktionary.orgWhite trolls were apoplectic and let rip. Source: Internet
While the pollies have been slugging it out our local artists have also let rip. Source: Internet