to get high to the point of feeling really awesome and eventually passing out
Dave: I had sex with HER???
Carlos: Yeah bro, you totally flatlined and you did it hahaaa.
Dave: Damn bro, why'd you have to tell me that??
Carlos: Cause now you gotta buy her birth control pills.
by blahblahhblahhh March 13, 2010
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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.
by xKRASHx August 28, 2010
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A heart stopper. Someone that completely makes your heart stops in awe.
Man, that Emma girl, is a total flatliner.
by CxmeronL49 April 8, 2017
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The act of killing someone or using force to hurt somone badly.
by MJC612 April 24, 2009
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When ones cell phone has no signal at all and the cell phone shows no bars.
On some cell phones it comes up as a flat line instead of bars or an x.
May be used as Flatline, Flatlined, or Flatlining to describe having no cell reception.
Ex. 1

Dude 1: Dude, Where is this party?
Dude 2: Idk, call Sarah.
Dude 1: I can't I'm Flatlining.

Ex. 2

Girl: Why the hell didn't you call me back last night?
Boy: Sorry babe, I had a Flatline.

Ex. 3

Dude 1: Anyone have cell reception?
Dude 2: Naw, I'm Flatining.
Dude 3: I'm Flatlined too.
Dude 4: Got a Flatline.
by Lead Fist June 30, 2010
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one of the most fuckin amazing bands ever. mostly punk with their new album "the great awake" but also ska/punk especially in their other full length "destroy to create". from toronto. consists of chris cresswell (vox/guitar), scott brigham (guitar), paul ramirez (drums), and jon darbey (bass). great, original band. some of their best songs include "fred's got slacks", "eulogy", "spill your guts", and "this respirator".
the flatliners play a sick show and fuckin rock!
by fuck names! April 20, 2008
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