Hello im a 13 year old ue5 game developer. when i saw the theme i was really confused: Last Stand. i know this is a very dumb question to post here but i need some help.
it's very much open to interpretation but I guess you could think of a Last Stand as a 'final resistance' or a 'final battle' - it's the penultimate 'thing' that happens before a situation is resolved. So the CLASSIC example that I think we'll see a lot of in this game jam, is for example, a Tower Defense style game where the brave lone soldier has to survive an onslaught of enemies in their 'last stand. I hope that helps to explain it a bit more.
https://en.wikipedia.org/wiki/Last_stand
https://www.urbandictionary.com/define.php?term=last%20stand
https://tvtropes.org/pmwiki/pmwiki.php/Main/LastStand
Start with official definition of the word, like Wikipedia page. Urban dictionary shows slang definitions.
TvTropes is good for research, shows related themes/tropes/clichés in media.