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
Get the Flatline mug.
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
Get the Flatlining mug.
verb: to "kill" someone - literally or figuratively
"if you ever bring up my ex's name around my current squeeze again.....so help me dude, I WILL flatline you!"

"I heard one of the perps got flatlined by the cops at that liquor store robbery last night."
by Hipster November 18, 2006
Get the flatline mug.
brain dead, stupid , celebrally challenged, Stems from the flat line response of a dead person from ECG machine.
by Socrates September 15, 2003
Get the flatline mug.