The truth, Debbie, sister-in-law-of-mine, is that Bob Caldwell and "off the chain" are both good. Very good. Let me school you from the slang dictionary:
1. off the chain
fun or exciting. See "off the hook."
2. off the heezy
or "off the heezy for sheezy" meaning very cool. See "off the hook."
3. off the hizzle
see "off the hook"
4. off the hook
Exceptionally good. "Did you see John’s new 22" spinners? They was "off the hook!"
I hope that helps... But you got to know: once it hits this blog, the edgy life of a slang word has pretty well run it's course.