Sling (one's) hook British old-fashioned informal slang
The "hook" means an anchor of the ship, which must be lifted and tied with a rope or chain. Before the ship leaves, the anchor is removed.
The phrase refers to go away to another place.
He wants to sling his hook after he gets a new job.
I told my young sister to sling her hook because she broke my comestics.
The verb "sling" should be conjugated according to its tense.
The phrase appeared in the slang dictionary of 1874, which was defined as " polite invitation to go away".
Be extremely sleepy