"Reservoir Dogs," the exhilarating debut film of 29-year old writer/director Quentin Tarantino, is a ballet of macho posturing, gun-pointing, and the creative uses of every four-letter word imaginable. Its testosterone level is off every chart, and it happily wallows in its own juvenile love of criminals, violence, and vulgarity. Taking a note from Sam Peckinpah, Tarantino populated his film with morally ambiguous outlaws. Yes, these are criminals and killers, but damn, if they aren't charming and charismatic. Any chance we have of disliking these people is squashed in the film's opening sequence, which