Top definition
Refers to a nickname for niall horan on tumblr
There is also a fan fic called Daddy! Niall
And I believe a URL

which are all pretty good if you're a fandom tumblr user.
Girl1:"Saw daddyniall in 'This Is Us'

Girl2:" have you read his fan fics?"
Girl1: "Not yet!"
by narreh September 01, 2013
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