It's a word that I've noticed predominantly black hiphop culture has appropriated. It never used to be a black thing, it was just some wanker that solved every problem with a hammer. Now it means something about black people. Same way "gay" never used to be a sexuality issue.
I think it's like Alty said. It generally means what you said, and in the specific context of hip hop it means what Tupac said, and uninformed/intellectually dishonest racists have conflated the general definition with the specific context of black people and decided that there's a connection, if on no more than a rhetorical level. It's insidious.