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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.
Flatlined by Lead Fist July 5, 2010
V had flatlined after trying to gun down enemies.
flatlined by Byt0 December 14, 2020
When you text someone and they don't respond after they read it
Dude Nikki just flatlined me. It's been like fifteen minutes.
Flatlined by that last guy May 12, 2015
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.
flatlined by Chris Johnson February 19, 2004
The non-activity that one receives when he/she is being rejected.
Megan couldn't understand why Rich flatlined her - she began to wonder if it was because of all the junk in her trunk.
flatlined by Snocap September 20, 2006

Flatliner President 

An increasingly popular nickname for the 45th POTUS as he nears the end of his one and only term.
Thanks in great part to his mismanagement of the pandemic, the Grabber in Chief will from now on be known as the Flatliner President.