Fucked Up Hairline 

When your hairline looks awful or ghastly.
This may even cause others who see it to have a nauseating effect due to witnessing such an atrocity.

Drew aka Drewbacca perfectly exemplifies this definition:
His hairline resembles a staircase, now this wasn't done on purpose hence the "Fucked Up Hairline"

Visual Evidence:
Exhibit A:
http://farm4.static.flickr.com/3485/3183251697_f95103f461.jpg
Exhibit B:
http://farm4.static.flickr.com/3128/3178603647_11c3f91e80.jpg

Fucked Up Hairline by Hypebeast2009 January 10, 2009

Hairline 

The line where your hair starts. For some reason, dumbasses like to make fun of people's hairlines when they don't really matter.

Kid: U HaVe a rachet hairline!
Sane person: Why does it matter?

Hairline by Racist21 June 3, 2015

hairline perm

Usually said to someone with the name xander, that has a perm and a shitty hairline.

"Look at that kids shitty as hairline"
"Ya, he's trying to hide it with his perm"
"Just because of his hairline perm, I'm gonna assume his name is xander

hairline perm by Borgus G peenerton December 31, 2020

hairline 

something that Jojo Siwa doesn't have

I haven't been to urban dictionary since the last time Jojo Siwa had a hairline.

hairline by sisterslang March 21, 2020

Hairtip 

A Rare case in which the tip of a males penis suffers hair growth on the foreskin. Like a pigeon slightly sticking his beak out of a tree bush.

A: I saw a hairtip in the locker room today
B: What's a hairtip?
A: Look down maybe? Lol

Hairtip by Schoolboy Quavo October 31, 2016

Hairline Malfunction 

Literally Ben perrins

Look at that hairline Malfunction, he is fiiiit

Hairline Malfunction by Pigeon eater78 June 26, 2021

saitamas_hairline 

a hot and funny mf on tiktok that has good taste and loves all their mutuals

“hey did you see saitamas_hairline’s new post?”
“yeah they’re literally my fav acc on tiktok omg”

saitamas_hairline by imfatkillme March 22, 2021