Someone with no sense of humour, or who is just plain boring, is 'shit crack'
A place that isn't entertaining can be said to have 'shit crack'
"I was at this party, but left because it was shit crack"
George Bush is shit crack, but i hated him already before he was sworn into presidency, the second time.
All mainstream commercial music (anything on Z100) is shit crack, meaning most people have a shit crack taste in music