Most of these lines are the doubled 맞아 맞아, the standard noise for agreeing with someone mid-story: "right, right", "exactly". It shows up three times here as on-screen caption text over a nodding listener, which is exactly where you will have heard it. Watch out for the unrelated verb in the same list: 두들겨 맞다 "get beaten up" and 해 맞을 일 use a different 맞다, meaning "be struck", which happens to be spelled the same.