Comment by hyperman1

There is also the signalling when a new, truly meaningless fragment pops up. The bigwig says it first, then his direct reports, then their underlings, etc.

So by using such a phrase, underlings signal both how close they are to bigwigs by knowing such a phrase first, and also demonstrate a vote for alignement, by quoting some phrases more and others less. Bigwigs raise status of underlings by repeating and expressing interest in their new phrases.

These phrases come and go in waves. Underlings laughing with them basically signal they are not worthy of attention in the political melee.