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canniversary 

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 (reddit.com/trees, 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!
canniversary by Milesabove July 6, 2011

canciversary 

1. The one-year anniversary of one's successful cancer treatment (cancer + anniversary).

2. A reason for a really, really big party, preferably in a foreign city.
Hey, let's all rent a house together in Amsterdam for a weekend to celebrate our friend's canciversary.
canciversary by c_ho April 7, 2010

cloniversary 

the anniversary (applies to weekly, monthly, and yearly) of biscuit and gravy’s cloning incident
“That would make it the 4-week cloniversary”

“Why do I like the word ‘cloniversary’ so much?”

dracotok anniversary 

august 22nd is the dracotok anniversary !” wtf do y’all want me to say lmaoo

cannediversary 

N. The yearly anniversary of when you were canned (a.k.a. let go, downsized, considered redundant).
Alternate use: canniversary
I've decided to throw a Cannediversary Party to celebrate the day I was tossed out of that corporate Hellhole. All the ladies will wear pink slips, we'll serve canned foods, downsized items like mini weenies, have a bonfired and end it by letting some firedworks go off.
cannediversary by PJeigh May 12, 2007

anniversary

the day you and your special someone began your relationship.
when is our anniversary?
anniversary by reformedpug February 7, 2017