Autonomous sensory meridian response” (ASMR) is a neologism for an alleged biological phenomenon characterized as a distinct, pleasurable tinglingsensation in the head, scalp or peripheral regions of the body in response to visual, auditory, olfactory, and/or cognitive stimuli. Other phrases to describe the sensation refer to it as a “brain orgasm”, “brain massage”, “head tingle”, “brain tingles”, “head orgasm”, “spine tingle”, and “braingasm”.

http://www.asmrvideos.com/ 
http://www.vice.com/read/asmr-the-good-feeling-no-one-can-explain 
http://rhizome.org/editorial/2013/may/8/notes-asmr-massumi-and-joy-digital-painting/