A combination of the words "choice" and "bonus." Circa 1983, Beta Theta Pi fraternity, UCLA. For example, "choice + bonus = chonus" as scrawled on a bathroom wall in the fraternity house.
Dude, that roadtrip to the Fiesta Bowl was totally chonus!
n. A cigarette. Tobbacoo wrapped in paper, usually with a filter.
Can I bum a chonus?