Answer: Reading the Urban Dictionary
In 2011, Watson, the best-known IBM supercomputer for its performance as a Jeopardy candidate, received a new tool in his language arsenal: cursing.
Researchers widening Watson's vocabulary and more nuanced and natural language use found it helpful to teach Watson slang and slang phrases. Basically they wanted to give Watson the ability to speak more like we're talking to each other and less like a supercomputer that carefully selects an answer.
For this purpose, the researchers have published Watson on Urban Dictionary, the massive Internet dictionary, and phrases. On the one hand, the experiment was a great success as the Urban Dictionary database radically expanded Watson's word selection and nuance of linguistic usage. On the other hand, Watson proved to be poor at distinguishing when his language was appropriate and when not ̵
In response to the changes in Watson's vocabulary, the researchers broke off the experiment and removed all references to the Urban Dictionary from its memory banks.