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1. A religion based solely around marijuana and those who utilize it for recreational purposes

2. A religious belief that is closesly linked to marijuana and all of its subsequent products.

3. It can also be, a hat!
1. A Preacher talking to a boy in church (before rape occurs):
"Hello cute little boy, why do youu dare disgrace the church by bringing a joint in here!"
"Why father, that's because i don't celebrate Christianity anymore, i'm a strict follower of 420ianity!"

2. Two friends at a party on Saturday night, packing a bowl:
"Man, are you going to church tomorrow morning?"
"Nah man, i celebrate 420ianity, so im going to my basement to get high!"
by LawrenceofAfghaniKoush October 17, 2009
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