A term that is used to mean smoking marijuana, or marijuana itself. It is only known by the people who do it, giving it somewhat of a codeword mentality. It stems from ire which is to be high or be in that state of mind. Generally used as a verb, but also used commonly as a noun in the place of weed. Pronounced eye-er it.
"Dude, You wanna go ire it."
"That was some killer ire it."
"All we did was ire it all night."