It belongs to a pretend language, not English. It is very likely rude. Knowing this will probably not enhance your ability to do anything except insult people.

A shunt is a hollow tube surgically placed in the brain (or occasionally in the spine) to help drain cerebrospinal fluid and redirect it to another location. Idk what the hell the other people on this site are smoking lol. This is English, and not extreme slang. I have seen that episode of American Dad, Good show :P

This is extreme slang or street talk. Only a very small number of people can speak like this or understand it, I don't think any of them use italki. Try urbandictionary or perhaps a rap fan site if you really need to.kmow.