Blue Waffles
When someone refers to a 'Blue Waffle' they're not referring to your typical blueberry breakfast-food.
A 'waffle' is a a slang term for vagina.
A 'blue waffle' is a slang term for a severe vaginal infection.
It's basically a slang term for an extremely nasty or severe vaginal infection/STD on the vagina. The infection could cause lesions on the outside of the vagina, as well as bruising, which causes it to look blue in color.
Yum, my face in the mirror. I hope i get that job I'm interviewing for...