Tosh?  Easy, it's a diminutive of "Mackintosh", thin rubberised cloth
and the garments made from it, named after its Scottish inventor
Charles Macintosh (1766 - 1843).  Why the player aficionados call it
thus while the rest of the world refers to 'Mac' or some such, who
knows?

Julian Dyer

 [ At http://en.wikipedia.org/wiki/Charles_Macintosh --
 [ "Charles Macintosh FRS (29 December 1766 - 25 July 1843) was a
 [ Scottish chemist and inventor of waterproof fabrics.  The Mackintosh
 [ raincoat (the variant spelling is now standard) is named for him."