Lewis & Short

vappa, ae, f. [kindr. with vapor; cf. vapidus], wine that has lost its spirit and flavor; palled, flat, vapid wine.

  1. I. Lit.: vitium musto quibusdam in locis iterum sponte fervere, quā calamitate deperit sapor vappaeque accipit nomen, probrosum etiam hominum, cum degeneravit animus, Plin. 14, 20, 25, § 125; Hor. S. 2, 3, 144; 1, 5, 16; Mart. 12, 48, 14.
  2. II. Transf., masc., a spoiled or worthless fellow, a good-fornothing, Cat. 28, 5; Hor. S. 1, 1, 104; 1, 2, 12; Auct. Priap. 14; cf. Plin. l. l. supra.