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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Someone severely lacking in personality; a person who kills any festive mood with their utter dullness
Dottie was having a good time, until she got stuck with that flatliner.
by D*Tice June 8, 2003
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Being so drunk that you blackout and can't recall a long period (an hour or more) from the previous evening.
I must have been flatlined last night, cause I don't remember stretching my scrotum skin in front of your parents.
by Chris Johnson February 20, 2004
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someone who is boring, unenergentic, tired, sleepy.
Dont be a flatliner! Here's a beer, c'mon lets get drunk!
by DanteM August 4, 2005
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