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Definition of blue waffle. 1  an infected vulva (vagina). 2  See more words with the same meaning: medicine (related to).  See more words with the same meaning: vulva ('vagina'), female genitalia.
Nasty fungus in vagina that resembles a blue waffle. http://www.urbandictionary.com/define.phâ¦. 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.