In Japanese, a short reading of "801" can be reading 8 as "ya," 0 as a western influenced "o" and 1 as "i." So, the "yaoi" numeric sequence has become otaku shorthand for the genre of male romance media and, following that logic, in countries that list the date month-day, August 1st is yaoi day!
(С)
Эм.
С днем яоя.