Slang meaning of sling one's hook

sling one's hook means: Vrb phrs. Go away. A demand or order to leave. E.g."You're not coming in here, sling your hook before I call for security."

What is the slang meaning/definition of sling one's hook ?

sling one's hook means: Vrb phrs. Go away. A demand or order to leave. E.g."You're not coming in here, sling your hook before I call for security."