flatline 

1. The effect caused after a severe case of insomnia in which you collapse immediately and sleep.

2. Used to describe an extreme measure of sleep. Incidentally this closely relates to the term "you can sleep when you're dead."

I didn't want to go anywhere, I had terrible sleep and when I came home from school I flatlined on the bed.

Person A: Hey where's Adam?
Person B: He got shitfaced and flatlined somewhere in the kitchen.

flatline by xKRASHx August 28, 2010

Flatline 

The act of not responding to a text, email, chat, or message.

So I got this girl's number at a party, but when I texted her, she flatlined me.

The guy accepted me on facebook, but whenever I chat him he flatlines me

Flatline by partyrocklifestyle November 13, 2011

flatline 

To have intercourse with a person in a rough, physically hurtful manner to the point where their consciousness or life is in question. An exageration of having intercourse to the point of someone dying.

I flatlined that ass so hard she was crying.

flatline by c0d1 February 18, 2011

flatline bitch 

One who just lays there during sex and takes it as it comes with no response as if dead.

Guy 1 - hey dude! You up for a round of golf?

Guy 2 - no dude I'm wiped out. went home with this chick last night and had to do all the work. She just laid there like a flatline bitch.

flatline bitch by dalycitybadgirl October 11, 2015

flatline cocktail 

Mixing painkillers and/or anti-anxiety pills with booze.

Bob always enjoys a flatline cocktail on his day off. One day he will wind up on a ventilator in a persistent vegetative state.

flatline cocktail by kajoe December 11, 2009

Flatline flip 

The mother of all drug combinations. This is when a person takes LSD, MDMA, alcohol, caffeine, nicotine, prescription opioids, prescription amphetamines (substitute for meth if you’re bummy) (or cocaine if you’re rich which you aren’t) as well as some Benadryl to kill nausea.

This combo is not meant to be attempted by anyone who isn’t a professional drug addict.

If done right the stimulating effects of the Molly, Acid and rX stimulants should completely override the sedation caused by the alcohol, Benadryl and Opioids making you feel completely sober.

Honestly you will probably overdose but think of how cool you will feel?

Friend 1: I am so high, I am candyflipping right now off of a gel tab and a Tesla pill!

Friend 2: *unresponsive*

Friend 1: I wish I was cool enough to flatline flip

Officer: What did your friend take? Be honest, we are trying to save his life?

Me: He.. He was flatline flipping.

Officer: Holy shit cool

Flatline flip by danasp_42 June 17, 2020

Facebook Flatline

When a friend's Facebook stops posting status updates for several months in a row. FB RECENT ACTIVITY is limited to increasingly less frequent notices that "X is now friends with ..." and an occasional "like."

I don't think I am FB friends with Nancy anymore.
Why?
I don't see any status updates from her anymore.
You're still friends with her, but she has Facebook Flatlined. I don't see anything either. Friend her on Twitter.

Facebook Flatline by BLT Tipster March 17, 2011