Autonomous sensory meridian response (ASMR) is a euphoric experience characterized by a static-like or tingling sensation on the skin that typically begins on the scalp and moves down the back of the neck and upper spine, precipitating relaxation.
As a personal experience, when I am listening to specific sounds (such as thoses in an ear massage, plastic crinkling and murmuring), I feel small intermittent touches behind the neck.
Many people register videos and sounds in order to induce "ASMR" to the listeners.
The origin of the "ASMR" effect is unclear, and the literal meaning of ASMR "Autonomous sensory meridian response" is not clear. The word ASMR is much more often than "Autonomous sensory meridian response", and many do not even know its meaning.