subspace

sub- +‎ space

subspace (countable and uncountable, plural subspaces)

1. (countable, mathematics) A subset of a space which is a space in its own right.
2. (uncountable, science fiction) Any (often unspecified) method of communicating faster than light speed.

sub +‎ space (in sense of submissive), punning on the other etymology from sub-.

subspace (uncountable)

1. (BDSM) The psychological state of the submissive or "bottom" during sadomasochistic activity.
   • 2000, Gloria G Brame, Come hither: a commonsense guide to kinky sex‎

     My problem, though, is that when he whips me, I resist going into subspace. He has to whip me for fifteen or twenty minutes before I even begin to feel any psychological effects.

   • 2003, Chelsea Shepard, Two Moons: Worthy of a Master Book One

     When he was far gone into subspace, pain was enough to make him come.

• topspace