"person a: "dude, i had the best backgasm earlier today on the train" person b: "yeah i saw, everybody did""
that amazing feeling you get when you lean back and an indescribable [pleasure] shoots up your [spine]
""person a: "dude, i had the best backgasm earlier today on the train" person b: "yeah i saw, everybody did""" What is the definition of "backgasm"?