mamzer

noun3

1. •
   (Judaism) A child born to Jewish parents whose relationship is incestuous or otherwise forbidden by Jewish law (e.g. an unmarried man and a married woman), or the descendant of such a person.

   • No descendant of a mamzer may ever enter the assembly, no matter how many generations later. — 2001
2. •
   (offensive) A child who is born from an incestuous or adulterous relationship; a bastard.
3. •
   (slang, offensive) A contemptible person; a jerk.