A hot head is someone who loses control of their anger easily.
The idiom "it's all in your head" means that something is imagined or not real, and is only a product of one's thoughts or perceptions. It often implies that a person's fears or concerns are not grounded in reality.
Imagine that your head is a light bulb. If it is screwed on right, the bulb lights up. This idiom can mean either that you are a smart person or that you are a dumb one, depending on how you use it. Examples: He really has his head screwed on right. This means he is smart. He doesn't have his head screwed on right. This means he is dumb.
Someone is complimenting your intelligence.
Having a hot head typically means that someone is quick to anger or easily becomes agitated or frustrated. This term is often used to describe individuals who have a tendency to react impulsively or emotionally in situations that may not warrant such a strong reaction.
"Weak in the head" is an informal idiom that means someone is not very intelligent or has poor judgment. It suggests that the person is not very mentally sharp or capable.
angry
The head person.
Stay calm
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
"Dive in head first" is to rush into a situation without thinking.
To turn completely around and head back in the direction you came from.
Keep an idea in ones head to act on it later.
If used as an idiom, it usually means that you are confused about something. The image is of you scratching your head to try to think better.
"Your head is going to explode" IS an idiom. It means you have too much to think about.
It can mean several things, depending on whether it is meant literally or as an idiom. Literally, it would mean that the tip of something is red-hot, or glowing with heat. As an idiom, a "tip" is information that can be used in a situation, so a "red-hot" one would be something that is especially important at the moment, something timely and greatly useful.
A very severe headache, as if an imaginary axe is "splitting your head in two".
"Head over heels in love" would be one idiom.