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1.
A teenager who wants to shock their family and peers by trying to become a wiccan, but has no idea what she/he is doing. The term was popularized by the TV show "Buffy the Vampire Slayer".

Usualy a vegetarian and goes by a silly craft name. Sometimes refered to as a fluff bunny.

A mockery of the Wiccan religion.
OMG! Tina is such a wanna-blessed-be! She changed her name to Raynbow Moondoggie, bought herself a pentegram as big as her face, and has not eaten red meat in three whole days now. I hear that her parents are like totaly freak'n and threatened to call like an exorcist or something..........
by the Voice February 10, 2004
 
2.
Someone who wants to be a witch but doesn't get witchcraft at all. Play on wannabe and blessed be (wiccan saying)
"No witches in your witch group?"
"No just a bunch of wannablessedbes."
~said by Willow Rosenburg in Hush in Buffy the Vampire Slayer
by alexrealwitch May 19, 2012