I've heard this words' pair too often and I never knew what does it mean?
Until I read these two posts: Ultra-Balkanization Makes Lisp Autistic and Reddit and Lisp psychosis.
In general every Lisp developer tends to write "new" super-puper Lisp, invent the wheel, write own "cool" emacs extension and tell to the world that he is a HACKER. I love this.
Nowadays, Clojure is the real answer for Lisp guys. It can consolidate the Lisp language flexibility and JVM power. I think it's a good choice.