Wiktionary
fly-poster
n. 1 A poster, especially for advertisement purposes, put up illegally 2 One who posts such posters
Usage examples of "fly-poster".
Nor had I seen any more handbills like the one posted in the Golden Horn, even though I scanned the dead walls, cornerposts, pillories and all the various other spots favoured by the city's fly-posters, including the insides of a couple of taverns and coffee-houses.