He got lost in the deserted office building, feeling like he was trapped in the backrooms.

backrooms 是由 back（后面）和 rooms（房间）组成的复合词，字面意思是"后面的房间"。 在当代网络文化中，backrooms 特指一种都市传说/恐怖美学概念，描述看似普通但诡异无限延伸的办公室空间，常与"迷路""被困"等恐怖体验相关联。