A very ancient word first documented in the 13th Century with roots in Norsk languages. Used to describe the female genitalia in a derogatory manner. Or, more commonly, to insult someone with reference to a female genitalia. Linked directly to the degradation of the masculine by comparison to the feminine.
In contemporary culture this is considered to be one of, if not the most offensive word in the English language.
You killed my Hamster you nasty Cunt!