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A stupid nickname for Niall Horan on Tumblr. It’s used by people who think they’re cool and still use fanfiction.
DM: 'Hey DaddyNiall, are you going to cry again at the concert?'
Post caption: 'Daddyniall is the best ship ever. No one disagrees.'
Comment: 'This fanfic is so bad, it’s like DaddyNiall wrote it in a bathroom.'