It’s more Latin!  This phrase meaning literally “to infinity” or loosely “without end”.  In conversation and writing it is used to describe a process that continues without a foreseeable conclusion or resolution, not to describe a person physically moving toward infinity.  If one were moving toward infinity what would that mean?

Ad Infinitum…Et Ultra!

Since infinity is not a physical object, one could never reach infinity much less move past it.  Even if given all of eternity (I assume).  Infinity is defined as the quality of being infinite, or without end or limit; or a space, amount or period of time that is without limit or end.  Well, that clears things up…not!  One thing is known – this post will not go on ad infinitum.  The End.