To express such demand or activity that it is beyond normal conditions.
Out of control.
Stems from: A phone ringing so much that it remains off the hook as a result. (so busy)
Man that cat was fighting 6 people and he beat them all. Yo, it was "off the hook", you should have seen it!!
Punchline to a joke only you understand.
Two elephants are in the bathtub.
One elephant says, "Pass the soap."
The other elephant says, "No soap...radio!"
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