Literal translation is snot eating
Eating your own snot is commonly referred to as "mucophagy." While it may seem unappealing to many, some people do this habitually. There is limited scientific research on the practice, but it is thought to be a natural behavior in some animals and may have developed for various reasons, including potential immune benefits.
The medical term for the word booger is nasal mucus or mucus. The thickness and color of it can vary and it has many uses such as helping to rid the body of a virus and protecting the inside of the nose.