designated listener
The person in a group of skiiers or snowboarders who is not listening to an ipod and therefore has the respnsibility of warning the others of avalanches.
left out person/ loser: To bad everyone going on the ski trip are either iboarders or iskiiers, i don't wanna be the designated listener.. i am not their bitch- you know what, i'm gonna start my own club.. us with old-school walkmans.. we will be the walkboarding and walkskiing club!
girl: uhhh ok good luck with that... freak
girl: uhhh ok good luck with that... freak
designated listener
A person who may not understand what you're describing, but explaining a complex issue to them helps you better understand the problem, and therefore find a solution.
Although Jane does not know anything about machine learning she is happy to be John's designated listener when he describes the programming interface problems he is having with CHATGPT. In the process he was able to identify that he was using the wrong model/engine.