The act of dancing with one finger (generally the index finger) extended. Can be done with one or both hands.
Disco finger has existed as long as mankind; in ancient Egyptian hieroglyphics we see the pharaohs, digits extended in exaltation of what can only be described as the precursors of pop.
The are many variations on the current disco finger--arm-pumping, twirling, the doorbell--and possible adaptations are still being discovered to this day.
While the rest of the crowd engaged in the ubiquitous "rock fist," Benway stood out from the crowd with his enthusiastic disco finger, thus showing his appreciation of the music.
Females commonly use primitive and sexual dance moves (Twerking or Slut Drops) whilst clubbing to attract a fertile male for intercourse.
During this mating ritual, the keener female dancers and particularly the larger ladies perspiratie heavily.... The additional moisture between the "Lady Lips" results in "Disco Fanny"
Eww... You'reminge stinks! You've got disco fanny!!