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2.
An extreme high by marijuana. Or a large pipe or smoking utensil to inhale marijuana. Or any exageration used to explain marijuana.
Preston has a sick piece. Its a chronic Boom.

Last night was a Chronic boom!!!
by 420kid May 05, 2010
 
1.
The act of attaching copious amounts of marijuana to any type of dynamite or firework which results in a massive explosion of kush that spreads a god-like odor throughout the land.
Last night, I got some of my best afghan kush and tried a chronic boom. It was an amazing sight.

by Trickmaster 5002 March 01, 2009