green snot; greenish nasal mucus
Colloquial term for thick, greenish nasal discharge, often associated with a cold or sinus infection. The 青 (あお) here refers to the greenish color, not blue.
See also: 青洟
I have a cold and green snot is coming out.
The child has green snot running down his nose.
Standard colloquial spelling using っぱな for the nasal mucus sense.
Rare kanji spelling using 洟 (はな) for nasal mucus; not commonly used.
Compound of 青 (あお, 'blue/green') + っぱな, an emphatic colloquial form of 洟 (はな, 'nasal mucus'). The っ adds a casual, slightly vulgar nuance.