A person who Acts/Looks like Justin Bieber,
or attempts to disguise themselves as Justin Bieber.
This sometimes happens with teenage boys who think that if they act/look like Justin Bieber then they have a chance at getting laid.
Kid - Woah! My friend John totally looks like Justin Bieber!
Other Kid - Pshhh... What a Wannabieber...
Someone who looks, acts, sings, or dances like Justin Bieber. This includes, but is not limited to, a new Bieber-like haircut, random chick-like dancing, or obsessive squeaky-voiced singing.
Brock: Did Mason get a haircut?
Jordan: Yeah, he's such a wannabieber
A guy that wears the same clothes, and has the exact same hair as Justin Bieber.
Whoa, that kid is such a wannabieb!
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A guy who looks or dresses like Justin Bieber. spends a lot of time getting ready
look at that guy... he's such a Wannabiebs
Someone who greatly resembles Justin Beiber.
Ie: Hairstyle, Clothing, etc.
"I Went To The Mall Yesterday N Saw A WannaBieber Trying To Talk To Some Chick"