look up any word, like donkey punch:
 
1.
Someone who randomly mentions pop star Justin Bieber to piss off the members of the discussion. Very popular on youtube.
Bieber Troll (on a Metallica Video)
METALLICA SUCKS!!!! ALL THEY DO IS DROP F-BOMBS AND SLAP THEIR INSTRUMENTS LOUDLY!!!! JUSTIN BIEBER IS BETTER AND HAS MORE TALENT THAN METALLICA
by eaglestrolol November 03, 2010
67 15