cun

Unfortunately, Lojban does not have a direct equivalent for the English idiom "cun" as it is a constructed logical language focused on clarity and precision rather than idiomatic expressions. However, if you are referring to the vulgar term "cunt," a literal translation focusing on the anatomical reference would be "ninmu xadni" (female body part). If you are referring to the derogatory usage, you might use "xunre ninmu" (red woman) to capture a similar intensity in a culturally neutral way.