1 The act of jerking (jilling?) off on one of the many rides in a Disney theme park, especially the boring ones.
2 The act of orgasming on any theme park ride that could conceivably be at a disney park.
3 Masturbating to disney porn (seriously, funniest shit ever).
Guy#1: Sweet Jesus! The wheel of progress ride was so fucking boring so I had a disneygasm under my rain poncho so I wouldn't fall asleep.
Guy#2: Is that story even true?
Guy#1:...you bet your sweet ass it is.