In lunfardo is "police, vigilante" , also "snitch, whisk" although it is no longer used as much. The origin is quite discussed, but the most accepted version is that it is a fan vesre. An explanation is found in campilology: the vigilantes made their rounds with the cane hanging from the right hand, and that in the "fan language" known in Buenos Aires until the beginning of the twentieth century meant "I look for boyfriend", which caused grace to the criminals (and not so much) of the time, and remarked it calling them cob 'anis'.
