It seems to have a life of its own...
Justin Bieber's in the UK for a few days doing dome promo for his upcoming album Believe, and popped into the Capital FM studios for a quick chat with James Barr.
While he was there, James mentioned a Twitter trending topic to do with The Biebs, after a fan asked James to ask Justin how Jerry was.
Jerry, it turns out, is Justin's willy. Bit of an odd nickname, but even Justin himself says "my fans are a little innappropriate."
He didn't seem to understand the nickname either... check out the video below;