This sex act occurs when a male cuts their wrist, enough to draw blood, and uses that blood as a lubricate. When the male has ejaculated, the resulting image looks like a volcano. The original name is "Emotional Volcano."
1st Male-"Dude! My girlfriend and I were messing around when she asked if she could do an Emo V. O. with me!'
2nd Guy-"So what'd you do?"
1st Male-"She cut her wrist and used it to jack me off!"