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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
by partyrocklifestyle November 13, 2011
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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.
by c0d1 February 18, 2011
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Flatlíne

Awesome paladin tank on the horde side of the Bronzebeard EU server.

"Man that Flatlíne is the shizzle"

Known for his wit, handsome good cow looks, and ability to abuse bad dps.
Omg its Flatlíne. Watch your threat before he pwns you
by angryqqer August 21, 2011
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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.
by dalycitybadgirl October 11, 2015
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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.
by kajoe December 11, 2009
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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
by danasp_42 June 17, 2020
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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.
by BLT Tipster March 17, 2011
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