To have such an insane time on the dancefloor that you basically have a whole body orgasm. Most often seen at dubstep shows where the low infrasonic frequencies aid the process.
Holy fuck! I was at DJ Excision last night and had two dancegasms all over the floor!
A dance performance or video that is so well-executed that it's nearly orgasmic to watch.
Beyonce's music video to Single Ladies was amazing! I was having a dancegasm the entire three minutes!!