When a girl has a Blue Waffle and gets wet, then that liquid tends to have a different color than normal fluid, it's turns a blue-red color which is called Blueberry Jam.
Girl: Uh Uh Uhhhhhhh!!!!!!!
Boy:What The Hell is that!
Girl: It's BlueberryJam
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