Anything having to do with
1. chain mails
2. spam
3. "death if you don't forward this"
4. jabs at your patriotismif you don't do this or that
5. copied stauses
6. horoscopes
7. self congratulatory statements
8. statements about how tired, hungry, bored, etc one is
9. selling stuff
10. Enticements to further poster's business interests
Inane Clown Pussies is the proper derogatory term for the Insane Clown Posse, the horrorcore band derided by Eminem and some of his inane fans. Eminem, lacking either the vocabulary or the intelligence (or both) to substitute the frankly obvious and cutting word "inane" for "insane" missed a good opportunity to distinguish himself from the other high school dropouts he shares the stage with.