The word "freak" is often used as a form of slang to describe a person’s surprise or shock at a situation. It’s usually followed by the preposition, "out."
People who live in Boston are freaking out over the enormous amount of snow they’ve received this winter.
I freaked when I saw how much it was going to cost to get my car fixed.
Yolanda freaked out after learning her husband was in an accident.
Tom’s boss freaked out when he reviewed last quarter’s sales figures. (He was surprised and unhappy.)
I’m totally freaking out. (This is a common expression, especially among younger people.)
He’s freaking out.
A freak is also a person or a thing that is very unusual or has unusual physical features:
Circuses, carnivals, and fairs used to feature freak shows and put people with physical deformities on display.
A person who swallows swords, eats glass, or puts fire into his mouth would be called a freak.
In the 1970s, the word "freak" was used to describe a person who consumed a lot of drugs.
A neighbor down the street died in a freak accident. He was standing under a tree during a storm when suddenly a large branch fell off and killed him.
Note: It’s not polite to use the word "freak" to describe a person.