Where it comes from
In Ep. 106 the hosts watch it staged with a different cast and flag it as 'another one for the pod'. In Ep. 107 a listener suggests it as the reply to a flubbed call-and-response, and the hosts adopt it.
How the hosts use it
The call is 'Quaid Army' and the answer is 'righteous kill'. It tells them they did it wrong and leaves them flat-footed, and the hosts plan to say it to confused fans in Miami.
Why fans love it
The sketch itself is a tearful bully in a My Little Pony jacket.
Written by the AI from the transcripts. Every sentence was checked against them, one by one (the full episode transcript wherever a sentence names one); 5 sentences that failed the check are left out. How the check works.