Why is the four twenty pie called that?

The "Four Twenty" pie is a play on the slang term "420," which is associated with cannabis culture.

It's likely that the name is a humorous reference to the cannabis-related meaning of "420," and it's probably meant to be enjoyed by those familiar with the slang.

There's no real connection between the pie itself and cannabis, but the name adds a bit of fun and intrigue to the dessert.