Green’s Dictionary of Slang

(US) a piece of nasal mucus.

1890		DN I 18: Boogie [...] ball of mucus in the nose.
1903		S. Clapin New Dict. Americanisms.
1960		E. De Roo Big Rumble 108: Who needs his nose boogies?
1991		D. Simon Homicide (1993) 570: ‘Snot Boogie?’ [...] ‘Yeah [...] that’s what his friends called him.’.
1993		A. Rodriguez Spidertown (1994) 137: ‘I just needed to hear it once,’ she said, wiping her face with his comforter. ‘Don’t get boogies on my sheet.’.