Dick juggling thunder cunt

Unfortunately, Sindarin, being a fictional language created by J.R.R. Tolkien, does not have direct translations for modern English vulgarities or idioms. However, I can provide a translation that captures the essence using available vocabulary: "Rhaw hadol raeg." (Note: "Rhaw" means "body" or "flesh," "hadol" means "to throw" or "to juggle," and "raeg" means "violent" or "fierce," capturing the intensity of the original phrase.)