From the ArcaMax Publishing, Vocabulary Newsletter:
http://www.arcamax.com/news/vocabulary/s-343404-847169
juju \JOO-joo\ (noun) - 1 : An object superstitiously believed to
embody magical powers. 2 : The power associated with a juju.
"They have powerful juju. They can make juju to kill all of us." -- T.
M. Aluko, 'One Man, One Matchet'
Juju is of West African origin, akin to Hausa djudju, fetish, evil
spirit.