booger

The origin of "booger" is obscure but likely emerged as a colloquial Americanism in the mid-1800s. It may be an alteration of the English dialect word "bogey," which referred to a goblin or object of fear, possibly influenced by the earlier word "bug" for an insect or object of disgust. This semantic shift from a frightening specter to a piece of nasal mucus reflects a common linguistic pattern where terms for supernatural or disliked entities are applied humorously or disdainfully to bodily effluvia. The word solidified its specific, informal meaning in the 20th century, becoming a standard, if childish, term in American English.

The word "booger" is a simplex word of uncertain origin, likely a 19th-century American English slang formation. It functions as a single, unanalyzable unit in modern English.