Thus, likely indicates a scene where Joslyn James is the dominant (“top”) figure interacting with a “little lawn gnome” character or implied tiny person. “Top” could also refer to a piece of clothing (a top garment) if the search is misdirected, but within the lilhumpers lexicon, “top” usually means the dominant participant in a size/POV dynamic.
The phrase refers to a highly specific, indexed archival entry from April 21, 2020 (formatted as 20-04-21), featuring adult film performer Joslyn James in a production for the LilHumpers network. lilhumpers 20 04 21 joslyn james lil lawn gnome top