When you have sex with your sister and get her pregnant, and she keeps the baby, that makes you UNCLE DADDY
Me and my sister , I mean your mom wondered if you were gonna take me, your UNCLE DADDY or her, your AUNT MA to the parent teacher conferences? Being that your almost old enough to vote and still in the first grade.
by Katelynne's dad March 23, 2013
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1. N. Originally, a man who adopts a dog from the pound/humane society. 2. Now also refers to a boss, a playa, a pimp.
The vet asked if I was Mabel's uncle daddy and if I would authorize an anal exam.

The uncle daddy sez so, that's why.
by The uncle daddy February 1, 2005
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Name used during oral sex when the man is about to come in the woman's mouth and she is going to swallow it , said to turn him on more right before he has an orgasm.
Girl- Says "Oh Uncle Daddy, it tastes SO GOOD!"
Uncle Daddy - "Oh baby,I'm gonna come, take it all!!!"
by Kerry Lynne Robinson April 18, 2008
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A man who is willing to do all the ‘fun stuff’ with his own children, but does not partake in the basic day to day responsibilities, just like the fun uncle that comes over and plays with the kids, then gets to go home childless.
“I fed the kids, gave them baths and went to the PTA meeting today while you are over here playing Uncle Daddy.”

“He doesn’t help me with the kids at all, Joan, but the kids LOVE him because he’s so much fun. He’s such an Uncle Daddy.”
by kkole21 January 9, 2021
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When suck so bad at being a dad, you're demoted to Uncle.
He is so pathetic, that fool couldnt even get to the bus stop on time, i'm demoting him to uncle-daddy.
by DaddyLexx May 28, 2019
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An uncle that plays daddy to a kid that is not his and not telling the child that the uncle is really the daddy.
Uncle-daddy no, one or the other...
by Jack breeazy December 28, 2016
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