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1. Someone who is a bodybuilder but is not very good at.

2. Referring to an individual that lives under the delusion that he or she is loved by a person who obviously doesn't like them back.

3. A fuckstick
Person 1: Dang dude, I saw that girl with three other guys this weekend. Not to mention all the photos on her Facebook.

Person 2: You don't understand, she said she loved me!

Person 1: Gah, you're such a Hartline sometimes..

I've been working out for six months with this program and nothing! Why can't I get bigger??

Sorry dude, looks like you have Hartline Syndrome.

Driver: Oh my god, did you just see that asshole pull out in front of me?? He's flipping me off!!!

Passenger: Damn, some people are such Hartline's sometimes.
Hartline by Aterin September 14, 2010
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A high-regarded family of warlords and kings that has influences as far back as the 5000's BCE.
Spartan Warrior: Our 300 soldiers are no match for that small group of Hartline's! What should we do?!?

Gerald Butler: *wets pants*
Hartline by PhysicallyInsane August 20, 2008
1. Someone who is a bodybuilder but is not very good at.

2. Referring to an individual that lives under the delusion that he or she is loved by a person who obviously doesn't like them back.

3. A fuckstick
Person 1: Dang dude, I saw that girl with three other guys this weekend. Not to mention all the photos on her Facebook.

Person 2: You don't understand, she said she loved me!

Person 1: Gah, you're such a Hartline sometimes..

I've been working out for six months with this program and nothing! Why can't I get bigger??

Sorry dude, looks like you have Hartline Syndrome.

Driver: Oh my god, did you just see that asshole pull out in front of me?? He's flipping me off!!!

Passenger: Damn, some people are such Hartline's sometimes.
Hartline by Jessica_Johnson September 14, 2010

RC-XD w/ Hardline 

When you have intercourse with two girls at the same time, also known as a threesome. The word refers to a call of duty killstreak 3 kills with the perk hardline making it 2 kills. While getting and RC-XD with hardline in call of duty is pretty easy, it is extremely hard to accomplish in real life.
"Damnn the club is poppin tonight! You trying to drop an RC-XD w/ hardline!?"

"Brooo have you seen the ratio here, I'm trying to drop a god damn chopper gunner, lets goo!"
RC-XD w/ Hardline by DannyDimes December 8, 2020

Hardline electronics

Hardline Eletronics is a underground and experimental music genre that draws its inspiration from 1960s early electronic music, 70s Industrial and contemporary post-industrial genres such power electronics and glitch.
C: Hardline Electronics 4 Hardline People!
B.R: People?

hardliner 

An extreme straight edger who becomes loud and violent about one's views. Not a true edger and looked down apon for such ignorance to other's decisions.
The hardliner punched a stranger because they were smoking near them.
hardliner by Jen December 18, 2004

Heartline Fits 

An indie rock band that rules the streets of Miami.
"Have you seen the Heartline Fits?"
"yeah man, they rule these streets"
Heartline Fits by Anitta Bonghit January 18, 2012