its pronounced ::IS-UMM:: A word used as slang for marijuana. Made popular by the famous and under rated rapper Redmad. He uses the word in many of his songs when referring to the controlled substance........see also weed, herb, or tical
"so wuts good wit all the ism..........blaze it"
"my good man where is all the marijuana......light that stuff up"
"Spread the ism around until the ism reaches each end// take your fingers and your thumb from tip to tip// roll it in a motion then the top piece you lick" - lyrics from the redman song, how to roll a blunt off of the how high