In New Zealand this is what my son calls a bommy knocker

The opposite of a tally whacker

Sounds like a British sex term

Knocks boms

A bommy is a small metal plate attached to the side of old wooden ships. It would be attached outside the ship a few feet above the water line. A metal knocker was fixed to the bommy with a small float. If the ship started to take on water or loaded to much cargo, the ship would sit lower in the water and the knocker would hit the bommy, alerting the crew of potential problems.

Sounds good at least…

It’s a flail. Like a wooden stick with a chain and a solid metal ball on the end

An insult, a sex act, and/or a drink.

Never heard it before. I googled it in incognito tab, just in case.

Looks like a mace.

It’s when one boob is much bigger than the other.

Made up nonsense.

A typo by Stephen King

gibberish phrase from a children’s story i don’t know?

Sounds like gin and tea, served hot with a twist of lemon.