Shiftout "The bits that are shifted out are always the low order bits regardless...

In the PBP3 manual description of the shiftout command, it says "The bits shifted out are always the low order bits, regardless of the mode used, LSB or MSB". What does this mean?
If I do not use the /XX option for bits and therefore shift out 8 bits (default) selecting MSB first, are my bits shifted out MSB first? Or the lowest order bits shifted out forst (LSB)?