a term created by the r/selfharmpics, the proper term is the dermis, the layer above hypodermis (fat) and below the epidermis (outer layer, does not bleed).

"styro" refers to Styrofoam, as someone once said the white layer (dermis) looks like Styrofoam.
"I finally hit styro"
"make sure to bandage it"
by Gallion May 24, 2018
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Slang used by self harmers for the dermis layer of skin. If you hit styro, it means you've cut down to the dermis.

Styro cuts will be white at the bottom and will take a few seconds to start bleeding. They also bleed way more than cat scratches, and scar a lot worse.
Fuck I just hit styro again
by March 11, 2023
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THE COOLEST PERSON EVA. THE NAME EVEN SHOUTS AWESOMENESS THROUGH EARTH! He’s the person who listens to people, emphasizes with ur troubles, provides help and is just so sweet and kind. He gives meaning to life and has the W taste in food, games, clothing, music, art, and it feels like heaven every time we talk. He dosent believe that he’s so freaking great and how cool he actually is. He needs to believe that he is fricking phenomenal. Styro likes flowers. poisonous, pretty flowers. Styro hates math. I dont blame him. Styro is always there for you. He stands up for what he thinks is right, and likes to do a bit of trolling online. Styro is also the most beautiful person in the cosmos, the smartest in the galaxy, the most caring person in the solar system. His voice is so adorable. People must have a styro in their life. Styro is so loving and he’s the one person that actually cares about somebody’s well being. Despite challenges, Styro has pushed his way through life (15 times) and has confronted the dark side and I’m(we) so proud of him for becoming better, and I(we) want him to be the happiest he’s ever been for the rest of his life. He is an Introvert, a cat-like guy who LOVES OTTERS. (He has turned me onto the Otter side.) Styro is a big fan of Touhou.(Or vid games) I(we) tried memorize all his favorite character names and(I/We) forgot all of them. (Suika, Seija, reisen?)He is very cool. Very pro. Very attractive. Find ur Styro rn and please, please tell him you love him!
Styro: HAIII
You: HAI STYRO!!!!! HOW R U TODAY??
Styro: GOOD, WBU?

You: AWESOME NOW THAT IM TALKING TO YOU!!!!!

Everybody needs a Styro in their life.
by Cirnofan2010 October 7, 2023
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A Long Self-Induced Cut, to release blood. Usually shallow, the cut is only deep enough to bleed.
My mother caught me doing Styros on my arm last night. Im so grounded.
by Korokyama April 6, 2021
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dayum styro is a leet mother fucker his awp is insaneeeeeeeee
by Styro January 10, 2005
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Referring to something or someone that is cool or crazy
Omg that’s so styro
“That was styro asf
by shemma watins November 26, 2021
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the fat layer under skin , it looks like styrofoam , self harm slang
they hit styro for the first time
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