caló
noun
ca·ló kə-ˈlō 
: any of several Spanish argots
especially : an argot used by Chicano youths in cities of the U.S. Southwest
Word History
Etymology
borrowed from Spanish, "argot, speech of the Spanish Roma," borrowed from Iberian Romani kalo "speech of the Roma, black," going back to Old Indo-Aryan *kāla- "black, dark" (whence Sanskrit kālaḥ "black, dark blue"), borrowed from a Dravidian source akin to Kannada kāḷ "blackness," kaḍu "blackness, black," Telugu karu "black"
First Known Use
1944, in the meaning defined above