Etymological Note: From cash ‘money in the form of bills or coins.’ Imitative of hashish ‘a hullucinogenic resinous extract of the hemp plant,’ which also lends a connotation of illicitness or addiction.
Citations:
1989Usenet: comp.sys.mac.digest (Apr. 4) “Info-Mac Digest V7 #63”: Thanks to everyone who has sent the lifegiving cashish though. It keeps me posting. 1992 Douglas H. Erret Usenet: rec.music.phish (Nov. 2) “Columbus, OH Show”: Drinks at the Newport are heavy on the wallet…mucho cashish. 1999 Isobel Kennedy @ New York City Market News International (Oct. 18) “Talk From Trenches—Us Stocks, CPI Will Tell It All”: If you started out Sept with $50,000 in a 401k plan, you would now have only $46,150. And that is a lot of “cashish-ola” even if it’s only on paper. 2000 J.J. Connolly Layer Cake (Apr. 6) p. 15: After a few false starts and offers of hare-brained, get-rich-quick schemes that would only get me put away for stretches, I started moving bits and pieces around town just to keep my hand in really and to top up my dwindling cashish reserve. 2005 [theperfectcrime] Ask Metafilter (June 10) “My debit card was lost/stolen and fraudulently misused”: The system told me that my balance was several hundred dollars overdrawn, and when I checked the most recently posted transactions, the amounts ($50-75) did not immediately ring a bell. I also knew that my shit was not fucked up to the tune of (at least quite) that much cashish.