A pathetic teenage boy who imitates Justin Bieber in the hope that they will be more likely to get girls. Usually has swishy hair and sings Justin songs to himself.
Have you seen Tom's new hairstyle? He is such a wannabieber.
anyone who has a hairstyle like Justin bieber. These people will deny liking justin bieber but if you actually knew the you would find out that they watch his videos online and love his music. these people can aften be caught humming the tune to "baby baby baby"
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.