What is the origin of the idiom "tar baby" and when to use it?

The idiom "tar baby" originates from African-American folklore and gained wider recognition through the Uncle Remus stories written by Joel Chandler Harris in the late 19th century. In the stories, the tar baby is a doll made of tar and turpentine used by Br'er Fox to trap Br'er Rabbit. This expression has since evolved to represent a situation or problem that becomes more difficult to handle the more one gets involved with it.