Can either be
really good pot that's not quite
the good shit, i.e. good seeds grown outdoors or bad seeds grown in doors; this usually is priced half way between regs an goods;;
OR it can be pretty bad stuff that is simply free of stems and too many seeds and therefore some jerk-off calls it mids so he can justify selling it to you for more $5 or $10 more than it should be
At least... this is what I hear from
my friends who do that kind of thing