An Mcflyer is simply an mcfly-fan. But it sounds better to say McFlyer. A Mcflyer isn't normally mcfly-teenie, even if it can be. Everyone who is a fan of mcfly is a Mcflyer, even if they like the word or not.

They don't HAVE to call themself a Mcflyer if they don't like it, but that's up to them.
You: Hey, what are you?
Me: I'm a mcflyer!
by Mcflyer April 9, 2009
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a promiscuous boy that flys from girl to girl
This boy sitting next to me in psychology class is such a mcflyer. watch out!
by Hrider and Ttittys March 7, 2011
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