'Siss' definitions:

Definition of 'siss'

From: WordNet
verb
Express or utter with a hiss [syn: hiss, sizz, siss, sibilate]
verb
Make a sharp hissing sound, as if to show disapproval [syn: hiss, siss, sizz, sibilate]

Definition of 'Siss'

From: GCIDE
  • Siss \Siss\, v. i. [Of imitative origin; cf. D. sissen, G. zischen.] To make a hissing sound; as, a flatiron hot enough to siss when touched with a wet finger. [Colloq. U. S.; Local, Eng.] [1913 Webster]

Definition of 'Siss'

From: GCIDE
  • Siss \Siss\, n. A hissing noise. [Colloq. U. S.] [1913 Webster]