This is question for those who self-identify as Reformed Universalist or Calvinistic Universalist. To you what does the term mean? If you had to give a short introduction to it (you get to define “short”!), what would you say?
To me, its universalism that uses Calvinism as a foundation. It is exclusivist, that is, it believes that no one is saved without faith in Christ. Man is unable to naturally turn to Christ, however, due to our sin. Because of His great love, God has elected to save some- known as the Elect- from sin and consequently punishment in the next life. The Elect are destined for glorification in Christ, destined to be His Bride. Since His Elect are naturally unable to accept the Gospel, He transforms them in order that they may believe and be saved. No one whom he has elected shall die in their sins. His draw is irresistible, and to only a limited number of people.
The reprobate (non-Elect) will suffer in Hell in the next life for their sins. But (this is where we differ from traditional Calvinists) the suffering is remedial and, consequently, temporary. Eventually, all will be saved in Christ Jesus.
So it seems to me that the only difference between Reformed Universists and traditional Calvinists is in respect to the reprobate. They insist that hell is eternal and none escape it who are sent there. We insist that hell is remedial and temporary, that none shall be damned there forever.