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3. Flatliner
A person whos eyebrows lack an arch.
Gentleman: Hon, you should really pluck your eyebrows, you look like a total flatliner.
Woman: Thanks, Hon.
1. flatliner
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 Jun 8, 2003 add a video
2. flatliner
someone who is boring, unenergentic, tired, sleepy.
Dont be a flatliner! Here's a beer, c'mon lets get drunk!
by DanteM Aug 3, 2005 add a video
4. Flatliner
A mindless person or someone with no personality; gives blank stares, especially when presented with ideas or facts that should arouse some sort of reaction in a sentient being. Basically brain dead or mentally challenged. It would be improper to use this against someone who has a real diagnosed disability of course. More like, if you meet someone in a professional capacity whose title suggests they are intelligent, but really they just stand around looking dumb.
"I told Guido that the server was down and he said 'So...?'. Is that guy a fucking flatliner?"
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