Flatlining 

When a person doesn't know hot to kiss and either 1) sits there with a limp, half-open mouth and slobers all over your face or 2) puckers up and is otherwise unresponsive.

Kev: Yo man, that girl Cheyanne totally flatlined me, ugh.
Acquaintance: Ew dude, I hate flatlining! What did you do then?
Kev: I dumped her, HA!

Flatlining by futchkoleepoels October 24, 2015

Flatliners

A group of male beings that have a love for wanking and drinking till they are completely fucked out of their minds. They aren’t the smartest of all people, they are known to make out with lizzards on the wall and get drunk until they start beating up someone. They have a soft spot for a little thing called “cactus jack”.

Man 1: hey, let’s get drunk
Man 2: no, let’s get flatliners drunk
Man 1: oh fuck

Flatliners by LeG_KDOG September 1, 2020

Flatliner 

When you’re fucking a diabetic so hard her insulin pump fails sending her into insulin shock only to be revived by cumming in her mouth.

Hey Tina. I hope your glucose levels are in check or else we might have a flatliner.

Flatliner by Thetunacan99 February 9, 2023

Emotional Flatliner 

Someone who shows no emotional response to anything, no matter how poignant or stirring. They’re either so repressed that nothing gets through their emotional firewall, or so disconnected from their feelings that even a child’s laugh, a heartfelt poem, a soulful song, or a breathtaking view leaves them completely unmoved. Picture a human equivalent of a flatline on an emotional EKG—zero reaction, just a blank stare.

"I played her my favorite song, the one that makes everyone cry, and she just shrugged—total Emotional Flatliner."

Emotional Flatliner by Raquel de la Roche August 5, 2025

Flatlings 

Large, saggy, flat breasts

"Jesus Christ! Did you see the flatlings on that lady?

Flatlings by Scummy Smith December 10, 2009

flatlining 

The act of leeting one's heart stop (flatlining) only to be brought back from death with CPR.

My hobby is flatlining.

flatlining by chocolock June 16, 2017

Flatlining 

Seeking out death or just embarrassment... Either recklessly or purposefully.

"Oh No! This dude is flatlining. Ignore him."

Becky-, "This guy is hitting on me pretty hard. Should I give him my number?
Kelly-, "He might just be flatlining. Ask him what you told him your name was."

Flatlining by Someguy1984 July 5, 2018