a boy with absolutely humungous eyebrows! like caterpillars
"whoa check out that guys eyebrows.. he looks like niall!"
by yes no yes March 3, 2009
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A man with big blue ocean eyes you could just stare in for hours, he loves cuddles and his huge penis will never disappoint you in the bedroom
"My boyfriend is so perfect"
"OMG hes such a Niall"
by xLaughing December 15, 2019
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a boy who usually can't make up his mind about which girl he wants.He chooses his second love to comfort him after his rejection from the first girl.Requires constant attention from girls but due to the fact he's not good looking he doesn't get too far.

Niall will lie his way out of any trouble he gets himself into blaming anyone possible but himself.really he plays everyone off eachother and stops his girlfriend from doing things which he feels is appropriate to be doing himself.
when someone "pulls a when niall" ,
they are pulling the paranoid creep of a boyfriend who thinks he's above the world and has the right to do stuff he doesnt allow others to do.
*e.g. "woah..that guys such a niall..she should dump him"

by aniallaters March 29, 2009
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a friends who will stab you in the back in relationship because they want to go out with your boy/girl friend
terry: yo adam watch out i think marcus is gonna niall on you and steph
adam: aight thanks ill be watchful
by shifty_character July 8, 2006
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Nipple licking motherfucker who lives a bitta 🍆...
Not gay but always says don’t knock it till you try it...
Has a woman atm but things could change
Never knocks down a fiddle with his sister either.....
by 1294558 July 25, 2019
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Niall is a very handsome Irish boy. He is extremely popular. He has big brown eyes and dark , jet-black hair. All the girls like him.He is skinny and likes girls who have a big ass , big boobs , is kind and is smart. He especially likes girls called Siena or Vanessa . He is a quadruple threat , meaning that he has a handsome face , is kind , is smart and has a long dick. He hates bullies and will do anything to protect his loved ones. Unfortunately he always has one friend who tries to eat his glory.
Girl 1: OMG Niall SAID HI TO ME TODAY !!
Girl 2: OMG !!!!!
Girl 3: To bad that he likes Siena....
by Maximillian Mus November 1, 2019
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