As with so many internet sayings, this originated at fandom_wank: http://www.journalfen.net/community/fandom_wank/510199.html

Those deleted comments in reply to what shuldig said are bohemianfaerie going on and on and ON regarding her thoughts on yaoi. And on and on some more. Her comments are saved somewhere or other, but what she thinks isn't the point: the point is that she, inappropriately and hilariously, thought this was the best time and place for her (ridiculous) essay.