Comica adespota fr. 1198 Kock, now 1100 K.-A.; in the accusative case, as here. Likewise or similarly in other lexica.
The verb involved here, xre/mptomai, seems more exactly to designate throat-clearing, involving expectoration, hawking and spitting (see LSJ s.v., and cf. chi 455). For bad manners in the theatre see e.g. Theophrastus, Characters 11.3 and 14.4, and generally -- though not on the present topic -- Pickard-Cambridge/Gould/Lewis, The Dramatic Festivals of Athens 272-3.