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A Japanese rockabilly guy or girl. Usually spotted dancing at the entrance to Yoyogi park in the Harajuku district of Tokyo.
Q: Where's that Elvis music coming from?

A: It's just a Billy dancing in front of the train station.
by jstewart October 05, 2005
18 52
a cold beer
I wanna drink a cold billy
by m pizzle October 28, 2003
24 85