In another place from the one you see it, this would be written "shit".
Sadly, one of two things is currently happening:
1: The administration of the website rigidly enforces censorship by blocking entire posts, or replacing all the letters of certain words with asterisks (*). Fortunately they have not got to the concept of censoring the other ways of writing that kind of $hit.
2: The writer of the word is far too sensitive and twee to write the word "shit".
There are other examples (such as fvck, tw@, and cvnt) of legitimate alternatives to words that are commonly used to emphasize something, etc.
I am so fed up of the ******* **** attitude about censoring that Yahoo employs on its forums.
$hit, there it goes again.
The common "rap"isized version of the slang term for fecal matter