Green’s Dictionary of Slang

(US black/campus) an inquisitive person, a peeping Tom.

1989		P. Munro Sl. U.
1999		J. Ridley Everybody Smokes in Hell 136: The lookie-lous planted themselves.
2000		F. Kellerman Stalker (2001) 430: She [...] started shooing the lookie-loos away from the crime scene.
2002		J. Ridley Drift (2003) 244: I could see, barely, lookie-lous watching the exploded, burning structure.
2002		pixiears21 🌐 Last week, I popped by the ‘Daredevil’ set again, this time solely as a looky-loo, and what I saw, I loved.
2012		L. Berney Whiplash River [ebook] He saw a crowd of lookie-loos [...] drawn [...] by the flashing police lights.
2020		D. Winslow ‘The San Diego Zoo’ in Broken 138: Villa has other troops gradually pushing the lookie-loos back.
2023		(con. 1962) J. Ellroy Enchanters 375: [P]atrol cops moved looky-loos out.