This phrase appears to be a specific search query or file title typically found on file-sharing sites or forums. In this context: "Avatar XXX" : Refers to an adult parody of the 2009 James Cameron film : Indicates the release year of the parody. "naija2moviescom"
It follows the pattern of:
Instead of CGI landscapes, these films use latex, animatronics, and makeup. The limitations of the effects often add to the charm or horror. this aint avatar xxx 2010 naija2moviescom cracked
So this is almost certainly a pirated porn parody movie file circulating on early 2010s warez/blogspot sites, not a research paper. If you saw it cited as a paper somewhere, it was either a joke entry or someone spoofing a citation. This phrase appears to be a specific search