shaniac is a term coined by Shane Madej in an episode of the web series Buzzfeed Unsolved, and refers to fans of the show that agree with him in the answer to the question "are ghosts real?" and is the opposite of a boogara. If a person claims to be a shaniac, it means they are inherently skeptical of most things and don't believe in ghosts, demons, etc.
A person who is a fan of the series BuzzFeed unsolved on YouTube and doesn't believe in ghosts, spirits, demons...
The names origin is from the co-host Shane Madej, which is the skeptic in the show. (So call him a Maniac for taunting spirits to kill him.)
Ryan: *shows potentialevidence for ghosts*
Person in the comments:. Nah, it's just very windy #shaniac
Shaniac is a nickname to the male name Shane. It is a joke/insult toward him. Calling him a maniac. More for crazy people that like to live life on the edge.
Sarcasm:"Hey, Shaniac, have you jumped off any cliffs this week? Or was that yesterday?"
If you are a Shaniac you don't believe in supernatural things and/or findings.
It's from the Buzzfeed Unsolved series. Shane is the co-host of the series and always questions Brians "facts" about supernatural things. Shane + Maniac = Shaniac