The atmospheric condition in which sluts still go out to bars despite bad weather conditions with no regard to their own comfortability.
"Tom, did you see that lightning? I think some sleather is rolling in."

"Dude, the sleather is amazing tonight, we're going out no matter what."
by RyMan24 November 4, 2011
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Sleather is a nickname for one of three types of people :
1. You’re first name is heather and last name begins with S you become sleather

2. If your partners name begins with S and your names Heather you become sleather

And thirdly ….
3. If you’re names heather and you’re a fanatic about slugs
To someone named Heather S: “hi sleather how are you”
To a couple sakes Sam and Heather: “sleather are you having a good day today”

To a slug fanatic Heather : “sleather is slithering with her slugs”
by °°°°°° September 6, 2021
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Enfuckerated to a high degree. Typically refers to software projects. Synonym: nerdstained
"This class extends four other classes and is wrapped in three layers of wrappers, the last of which is written in Assembler: it's really sleathered."
by dotkom November 19, 2013
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