edgeplay
What does edgeplay mean?
The deep end. Play that carries genuine physical or psychological risk, breath play, knife play, gun play, blood, where a real line is being walked. The 'edge' isn't fixed; it's whatever the people involved consider their limit. What's edgeplay for one couple is Tuesday for another. This is the territory where RACK earns its keep.
Origin
BDSM community term; the 'edge' refers to the line of acceptable risk, which is subjectively defined by the participants.