When you take a fat L, and your body momentarily dies because of the pain.
"stay with us bro, don't flat-line"
by lowkeyimblack June 3, 2018
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A term stemming from two seperate lexical choices one of which is 'Social' to be defined as relating to human society and its members and 'Flat-line' which is a medical term to show the absence of heart contractions or the disappearance of the rhythmic peaks displayed on a heart monitor.

In this sense the conjoined term means the 'dead sector of society' So to speak : Nerds, emo's, paedophiles and so on, people who are marginalised and ostracised from society.
Nerd 1: Dude I have a girlfriend now

Nerd 2: No way

Nerd 1: I'm heading off the Social Flat-line
by yami100 July 21, 2010
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The flattest line you’ll ever meet. Really socially awkward but also not at all it’s really weird. Super nice and will stuck with you for 10 years. What she doesn’t have in butt, she makes up for in personality
“Have you seen flat as a line today?”
“Yeah she’s so flat”
“But her face makes up for it
by Hamitha December 7, 2020
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