When you think other people who speak other languages are talking about you while speaking the other language in front of you.
I felt such xenolinguinoia after I walked into the mini mart wearing nothing but a lettuce leaf and the two clerks started conversing in Japanese after greeting me in English.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi