1. An unsatisfying prelude to a sexual act.
2. An attempt to move one's body to the rhythm of music, resulting in a convulsion like motion that induces the laughter of those in close proximity to the "dancer".
The acts seen at grade-school dances. The awkward moments experience in nightclubs. That which some consider "dancing", looks to the rest of us like an uncontrolable spams of the apendages.