To get high. It seems (to me) that the word probably derives from the Spanish verb "chumar," which can refer to intoxication by everything from alcohol to hallucinogens, and which derives from "achuma," the mescaline-containing San Pedro cactus native to the high, dry areas of South America. Conjugation: chumo, chumas, chuma, chumamos, chumaís, chuman. "Estoy chumando duro" = "I'm tripping hard."
A self-selected group of boys (including Barack Obama) at Punahou School who loved basketball and good times called themselves the Choom Gang. Choom is a verb, meaning “to smoke marijuana.”
by Hypodermic Noodle February 11, 2014
by Resbot Nermo of Apocraphy July 19, 2013
by Nuttin str8 Katrine December 7, 2006
"Drinking that bottle of ipecac was a bad idea, now I'm gonna CHOOM!"
"I told you not to eat that! Now you got choom all over evrything!"
"I told you not to eat that! Now you got choom all over evrything!"
by Silvar February 3, 2009
by Jivetech November 14, 2007