Fash can be either good or bad. It can mean something is super cool or someone looks super good or fashionable or it can be used as an expression of disgust or to mock someone.
"Ew have you seen what she's wearing?"
"Yeah, it's so fash."

"Wow Michael is lookin FASH today."

"Today we will have a test."
"FASH!"
by Camgurl0428 September 12, 2018
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To simply forget about or ignore something
Just fash the whole issue its a waste of your time
by Thatcatgirl June 2, 2016
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A pun on 'fashion' used in urban/hiphop styled commercials for Old Navy (and later Walmart). Designed primarily to sell clothes to girls and young women.
"Time to get our 'Fash-On'." -Walmart Commercial selling clothes to girls/young women.
by T.R.I. September 4, 2006
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slang for fashionable. Is commonly used in conjunction with the adjective "super" resulting in the phrase "super fashe." Sometimes spelled "super-fashe."
Hey girl, you look super-fashe in those skinny jeans and low cut T!

Wanna go to Top Shop with me? I heard Kate's new stuff is super-fashe.

Im only wearing my boxers and a wife-beater but it's still fashe, right? (WRONG, but the term is used correctly.)
by Triple A Vodka December 1, 2009
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1. n: German; a week of partying leading up to Mardi Gras. Anything goes this week.
During Fashing I went to 18 parties, was hung over six days, and had 248 alcoholic drinks.
by rentastrawberry October 26, 2004
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