The story
Named after a 2014 game made by Scott Cawthon, who pioneered the genre with his Five Nights at Freddy's games made in the Clickteam Fusion 2.5 game engine.
Etymology from Wiktionary, CC BY-SA 4.0.
sit and survive
Today it means: A subgenre of survival games where the player is in fixed place/position and must manage resources in order to survive until a timer finishes or an arbitrary checklist is completed. Full definition →