It is likely that you are referring to one of the following closely named topics: 1. DASS (Depression Anxiety Stress Scales)
The code represents an original production by the JAV studio DAS (ダスッ！, pronounced "Dasu!"). The "DASS" prefix, unique to this series, is a variation of the studio's standard code, which is typically "DASD". The numerical suffix, "127", indicates its position in the series. DASS-127