던가

'…or, whichever'

-던가 here is the ending that lays out alternatives and shrugs at the choice: 안 찍을 거면 빨리 내리던가 타던가 해야지 'if you're not scanning, get off or get on, one or the other.' Alone it can be a dare — 막을 테면 막던가 'block it if you can.' The standard spelling is -든가; 던 and 든 sound identical in speech, so subtitles use both freely.

Register: casual, blunt