In the skateboarding world. The transformation of someones style/attitude/clothing from a hiphop-oriented, slightly bling to a more out of style, 'I don't give a fuck'-approach.
If done by a professional skateboarder this is sometimes viewed as a marketing decision. However personal changes are probably a more important reason.
The opposite direction is also imaginable.

See also fresh, hesh.
"Hey Chris, who's that guy in your video part with the bald head, baggy jeans and the white shirt?"

Chris: "That's me. It's footage from last year, before I transformed from fresh to hesh."
by George Forehand June 02, 2005
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When two people (ideally two hesh girls) light each other’s cigarettes with their cigarettes.
Fuck my dart went out, could you give me a hesh girl kiss?
by poopydaidaiman December 31, 2019
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in skating world, person who doesn't give a fuck. and is known for it. commonly used in Coronado, CA
"dude, he's such a hesh saint"
by idgafbitch November 18, 2011
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