spout off
Verb
Meaning
(informal) To speak in a particularly boastful or arrogant manner.
(informal) To speak for a tedious or exasperating length of time.
(informal) To utter something in a brash, unwelcome, or unpleasant manner. (Can we add an example for this sense?)
Source: en.wiktionary.orgSynonyms
Examples
Generally, these are the sorts of people who are first to spout off that they won't put in the sweat or effort until after they get their "big break."
Get your facts straight next time you spout off on TV.
Instead, you just spout off nonsense and show the ignorance you’ve proven to have time and time again.
The laws are there…they need to be enforced and we need a premier that does not spout off that he supports the issuance of managerial level permits as it creates entry jobs for Caymanians.
Learn what T Cell immunity is before you spout off about things you clearly know nothing about.
Swimmers at Għadira Bay were treated to the sight of a large water spout off shore early in the afternoon.