hissing (Noun) — A fricative sound (especially as an expression of disapproval). ex. "the performers could not be heard over the hissing of the audience"
hissing (Verb) — Make a sharp hissing sound, as if to show disapproval.
hissing (Verb) — Move with a whooshing sound.
hissing (Verb) — Express or utter with a hiss.
hissing (Verb) — Show displeasure, as after a performance or speech.