This isn't an idiom because you can figure out what it means by defining the words. It's an exaggeration - the guy's eyes didn't literally pop out of his head, but he was opening them really wide with surprise so they looked like they were popping out.
It means your eyes are opened widely in surprise or shock, as if they're about to pop right out of your head.
Head over heels is an idiom because the meaning does not match what the words are saying.
"Your head is going to explode" IS an idiom. It means you have too much to think about.
"Head over heels in love" would be one idiom.
It has nothing to do with "supernatural powers of sight or insight".It simply means someone who has heightened awareness - you can see or sense things that most people would not notice. It often means something impossible to see or know about as expressed by " I would need to have eyes in the back of head " (to know about that.)When you can see things without really looking directly at them.This idiom is often about parents, especially moms, or about something important to an adult.For example: The child tried to sneak out of the house while the mother was cooking but she has eyes on the back of her head and anticipated that her child might try to leave.NOTE: This idiom can be said as "do" or "don't" / doesn't, or "would have to...".Dad has eyes in the back of his head when it comes to kids around his motorcycle. He yells at the kids before they even think to go near it.Grandma doesn't need to have eyes in the back of her head since her own children became middle aged adults.I would have to have eyes in the back of my head to keep up with the bad things my teenagers try to do.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
"She has eyes on the back of her head" is an idiom. It is used metaphorically to describe someone who is very aware of their surroundings or seems to have extra sensory perception.
You may have overstretched a muscle in the temple or forehead of even eye.
It's just a vivid description for eyes rolling upwards until the white part shows.
The idiom "she hammered it in your head" means that someone emphasized or repeated something continuously until it was firmly understood or remembered by you. It implies a forceful or repetitive communication style to ensure a message gets through clearly.
Head over heels is an idiom because the meaning does not match what the words are saying.
Nothing. Perhaps you're thinking of "eyes in the back of one's head," which means that the person is so alert and observant that it seems as though they have an extra set of eyes.
"Your head is going to explode" IS an idiom. It means you have too much to think about.
"Asshat" is an American idiom meaning obnoxious idiot. It alludes to a person having their head up their buttocks and wearing it as a hat.
"Head over heels in love" would be one idiom.
It has nothing to do with "supernatural powers of sight or insight".It simply means someone who has heightened awareness - you can see or sense things that most people would not notice. It often means something impossible to see or know about as expressed by " I would need to have eyes in the back of head " (to know about that.)When you can see things without really looking directly at them.This idiom is often about parents, especially moms, or about something important to an adult.For example: The child tried to sneak out of the house while the mother was cooking but she has eyes on the back of her head and anticipated that her child might try to leave.NOTE: This idiom can be said as "do" or "don't" / doesn't, or "would have to...".Dad has eyes in the back of his head when it comes to kids around his motorcycle. He yells at the kids before they even think to go near it.Grandma doesn't need to have eyes in the back of her head since her own children became middle aged adults.I would have to have eyes in the back of my head to keep up with the bad things my teenagers try to do.
You don't underestimate
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.