an event that is communicated to occur within a relatively short timespan but in reality it is known to all parties that it will not occur for a relatively long time.
Essentially, it is used to mean soon, except in a way that implies that it willneveractually happen.
Person A: "I'll finish my math homework SoonTM"
Person B: "Ok. Good luck with that. Call me when you've given up and you want to play some Genshin Impact."
Person A: "What no, I said I'm going to do it SoonTM, not NeverTM"
Person B: "If you insist."