Since you don't have to pop the octave (a lot of slapping involves octaves, but not all prominent octave bass lines are slapped or popped), you can just refer to it as octave playing or octave patterns. Everybody will know what you mean.
For a while, it was referred to as "disco bass" in German musician circles, but that is too limiting a term though its use in 70ies disco, funk and soul music was widespread. Of which "Miss You" was of course a prime example.
But there are enough other uses.
Always loved Glover's subtle octaves in the coda of Smoke On The Water (at 05:00), but the verses are full of his octave playing too.
Blackmore would do the same thing, never a passionate rhythm guitarist, his default playing style instead of chords was often just the root with the octave on the back beat.