The "low" feeling a person experiences (usually a submissive) after a BDSM session. Generally caused by a sharp decrease in endorphins, cortisol, epinephrine, and adrenaline after ending a session. Similar to coming down after a high.
Person 1: Are you feeling okay? You seem upset.
Person 2: Yeah it's just sub drop. I'll be back to normal in a bit.
Person 2: Yeah it's just sub drop. I'll be back to normal in a bit.
by sps_strawberry March 28, 2018