"하이고마, 내 정신 쫌 보그래이 손님을 세아놓고...미안하데이" (this is in nonstandard dialect). = 아이고, 내 정신 좀 봐, 손님을 세워 놓고 ... 미안해요 (standard modern Korean). = Oh my gosh, I'm so out of it, keeping a guest/customer standing. Sorry about that. * 세우다 = 1) make a person or a long object stand upright, 2) stop a person or thing (from a moving state). It is a causative verb of 서다 (1. to stand, 2. to stop). * -아/어 놓다 = put/leave in a certain state. * 세워 놓다 = 세우다 + -아/아 놓다 (우 combines with 어 to become 워) = to make/keep/leave someone/something standing. So it means to keep someone standing there instead of ushering them in or offering a chair, etc.

‘세아놓다’라는 말은 없어요. That is not a correct sentence. ‘세를 놓다(rent a room)’는 있습니다. 집세를 받으면서 방을 빌려준다는 의미예요. But, similarly, we use ‘세를 놓다’ It means ‘rent a room’. 세 means a charge.