rubber eared
n.— «It’s helluva difficult tae try an type wi a Scottish accent, so any choobish flames wull just be rubber-eared.» —“Translators” by Ewan Benson Usenet: eunet.jokes Nov. 28, 1990. (source: Double-Tongued Dictionary)
Further reading
The adjective corny describes someone or something “unsophisticated” or “naive.” This sense of corny goes back at least as far as the 1920s. Seed catalogs of the time often contained bits of goofy jokes and broad humor...