Lewis & Short

vŏmĭtus, ūs, m. [vomo], a throwing up, vomiting.

  1. I. Lit., Plaut. Merc. 3, 3, 15: pulmoneum vomitum vomere, to spit up the lungs, id. Rud. 2, 6, 27: aquam vomitu egerere, Curt. 7, 5, 8; Plin. 13, 23, 44, § 127; 20, 6, 23, § 50; Sen. Ep. 68, 6; Suet. Ner. 20 al.
  2. II. Transf., concr., that which is thrown up by vomiting, a vomit, Plin. 23, 8, 80, § 158; 29, 4, 27, § 86.
    Plur.: virides et nigri vomitus, Cels. 7, 23, 2.
    To denote a disgusting fellow, a puke, Lucil. ap. Non. p. 2, 30; Plaut. Most. 3, 1, 120.