Thought-terminating cliché
A form of loaded language that can be used to stop arguments from proceeding and end debate.
“Person 1 makes claim Y.
Claim Y sounds catchy.
Therefore, claim Y is true.”
Bo Bennett - Logically Fallacious
Thought-terminating clichés can be used to prevent arguments from proceeding by providing a speaker with a largely meaningless phrase they can recite as a false conclusion.
Much of the British public are familiar with thought-terminating clichés due to the political campaigning for the UK to leave the EU. “Brexit means Brexit”, “red, white and blue Brexit”, “no deal is better than a bad deal”, “let’s take back control” etc.
Elsewhere
Thought-terminating cliché - Wikipedia