Green’s Dictionary of Slang

bluey n.2

[blue adj.3 ]

a pornographic film.

[UK]K. Sampson Awaydays 94: Watching one of the higher art forms, a double-bill of German blueys called Grunt and The Fishmonger.
[Ire]P. Howard PS, I Scored the Bridesmaids 110: I go downstairs to pay the bill [...] not wanting Sorcha to find out about all the blueys I watched.