It means everything. It can be used to describe everything, mean, nasty, bitchy, nice, cool... whatever. It can also be a noun. If you don't know what something is, just say it's an ishi. it will work.
Katie is being such an ishi.
by lovealoo July 10, 2008
2 more definitions
Acronym for "I'd Still Hit It"
Man I haven't see that girl since high school, ISHI.
by Shawn Marcum November 22, 2012