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
Acronym for "I'd Still Hit It"
Man I haven't see that girl since high school, ISHI.
by Shawn Marcum November 22, 2012