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A dirty name made by mixing Nacker and Shite-bag. It’s like the worst insult from the North Dublin area, especially in Coolock, where people swear like crazy.
My cousin got called a Nack-Bag because he spilled his lunch on the bus.
She texted him: 'You’re a Nack-Bag, I swear.'
The teacher yelled, 'You’re all Nack-Bags!' after the class ran out of the room.