Gaz's best friend David is overweight and a little down-in-the-dumps over a recent bout of impotency; ex-foreman and amateur ballroom dancer Gerald (pink-slipped but afraid to tell his credit card obsessed wife) is hopelessly uptight; Horse, an old geezer whose dance repertoire includes the bump, the bus stop, the stomp and the funky chicken; and Guy, despite his love of " Singin' in the Rain " has no sense of rhythm -- hi is, however, generously endowed.  Still, with boundless determination and Gerald's well-meaning choreography, they're soon dancing to the sounds of Donna Summer, Hot Chocolate, Gary Glitter, Sister Sledge and Tom Jones as they prepare to go for the terrifying but necessary revelation that will distinguish them from ", your average ten bit stripper " . . .