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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Adjective.
(1) Describing anything that is uneventful, monotonous, boring, very ordinary.
(2) A pointless encounter. The basics of living with nothing more to excite/stimulate the mind and/or body.
A: Yo how was that party you were just at?
B: Dude, it fucking sucked, no beer, no fights, no girls, that party was flatline.
by Chachh August 23, 2006
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verb INFORMAL

1. A contemporary phenomenon; the complete lack of output, input, production or consumption of a human being, usually a young adult and heavily dosed with technology, while conscious and feeling contentedness and comfort.

2. Staring at a screen of no importance for 10 or more minutes while having absolutely no thoughts or other brain activity. Or regrets.

3. Often observed by a confounded teacher not paying attention but also not actively thinking of anything else nor doing anything else either.

4. The doom of human productiveness and self worth.

5. (Google) fail to increase; remain static.

6. (Google) to die
That kid is flatlinging.

Stop flatlining and do something with your life.

It's really a problem, them kids that can flatline all the time and feel purpose in life.

He'd rather flatline than learn something.
by Boris of Catan December 24, 2018
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When you text someone and they don't respond after they read it
Dude Nikki just flatlined me. It's been like fifteen minutes.
by that last guy May 11, 2015
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