Sing Soprano Meaning

(intransitive, idiomatic, euphemistic, of a man) To suffer castration or an injury to the testicles.

Example: 1997, Lance Morrow, "Goodbye, Miss Havisham," Time, 8 Dec.,
  A couple of women lawyers . . . drew a sharp, gleaming knife and applied it mentally to a target just south of the groom's waistline. If he doesn't like it, let the bastard go sing soprano to the A.C.L.U. Such was the ladies' thought.