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A year from the date on which you were fired from a job.
"Next week is my canniversary from Enron!"
by seoladair February 05, 2009
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The yearly celebration of a person's first time trying or enjoying cannabis in some form. Sometimes celebrated by sharing one's cannabis or paraphernalia with members of their smoking community (, for example). Can also be celebrated with cannabis-infused space cake with candles.

Also, just another reason to get together with your stoner friends and get baked. Not to be confused with 4/20, the annual holiday that celebrates pot culture in general.
Miles invites his stoner circle over to his house every year at 4:20 on July 5th to celebrate his canniversary with them. They usually bring him gifts of rolling papers, a dub sack, and next year, they're going to Amsterdam for his canniversary!
by Milesabove July 05, 2011
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