Ok, we got the idiom "be scared to death" = "feel extremely frightened" (see http://idioms.thefreedictionary.com/scare+to+death)
"be scared to death" does not mean "you are scared that you will be die".
Likewise, I want to express the idea that you are so scared that you almost pee in your pan?
So, can I use the expression "be scared to pee". However, when searching that term in Google, it shows many results like "The 3 years old boy is scared to pee" which means "he is afraid of peeing" but does not mean "he is extremely afraid of something to a level that he almost pees in his pan"
How to express the idea that you are so scared that you almost pee in your pan?
Best Answer
In casual speech, you would say “it scared the piss out of me”. This doesn’t mean that you actually peed yourself, but that the thing was so frightening that it could have made you do so.