niall 

a boy with absolutely humungous eyebrows! like caterpillars

"whoa check out that guys eyebrows.. he looks like niall!"

niall by yes no yes March 3, 2009

Niall 

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"

Niall by xLaughing December 15, 2019

Niall 

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"

Niall by aniallaters March 29, 2009

Niall 

Niall,A man With A Very Small Penis.

WoW Look Tiny Ass Dick,It Must Be Niall

Niall by Big D 40000000000000000000000 September 8, 2016

niall 

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

niall by shifty_character July 8, 2006

Niall 

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.....

Don’t be a niall

Niall by 1294558 July 25, 2019

Niall 

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....

Niall by Maximillian Mus November 1, 2019