Alternatively, could it be that the term is a misinterpretation or translation? "Cousins" in Russian is "cousins" but maybe there's a cultural nuance. Or perhaps a specific meme or image macros that became popular on Ok.ru in 2009 (a 10-year difference) but the user wrote 1989? Also, "Ok.ru" is a Russian social network, so maybe the blog post is intended for Russian or CIS audience.