No, it is "get your mind out of the gutter," and it means "stop thinking about naughty things and stick to the subject." You use it when someone deliberately mis-interprets something said or done as a sexual innuendo.
In this idiom, "He has a big head" means that the person is arrogant or conceited. It suggests that the person thinks highly of themselves and may not be humble.
He has an old head on young shoulders.
Which phrase makes no sense? That's the idiom.
Smart is an adjective; smart, smarter, smartest. Example sentences:My child is the smart one in the class!You do not smart mouth me.That is a really smart idea.
This idiomatic expression means that the person has caused his own problem. It's like saying "you created the fix that you're in".
It is a horse-racing term. If you keep control of a horse's head, you control the way that the horse runs, and how fast it goes. Keeping your head means keeping control of yourself and staying calm in all situations.
The idiom "beat your brains out" means to think very hard or try very hard to understand or figure something out. It can also imply putting in a lot of effort or working diligently towards a goal.
This is not an idiom. Jove is the same as Jupiter, who is Zeus. He was the head God in Greek and Roman mythology. "By Jove" is an oath -- you're swearing to something on the name of the God.
He's head over heels about her.
QUIT THINKING DIRTY THOUGHTS~ -- Typically referring to sexual thoughts.
If someone has a swelled head, they are conceited or a braggart. It is as if their head is so full of themselves that it has swollen up.
Talking someone's head off just means talking too much - imagine talking so much that their ears fill up and get so heavy their head falls off. It's just a fanciful way of saying "let the other person talk also."