When Giovanni Adams launches into his effulgent solo show, “Love Is a Dirty Word,” it’s as if he’s immediately racing against the clock. Words gush out of this young man’s mouth, not because Adams’ narrator is in danger, but because he observes his world with unquenchable hunger, exulting in whatever enters his field of vision and then in his own conscientious, hyper-articulate expression of it. The Tilted Field production, which opened Saturday, Nov.