I no this sounds dumb but wot does endgame mean i hav no idea help please

It means that this is what will be at the end of a "ship"- relationship (in a movie,show, etc.) that will go through a lot from the beginning to the end but it is a certainty that everyone knows the couple will ultimately end up together despite obstacles or other relationships they may hold in the course of their journey. An "endgame ship" is usually the one with the largest fan-following and highly supported by the writer/s of the story and it’s also the one that goes through the most happening, filled with troubles and misunderstandings.