RhymeZone: pish definitions

Definitions of pish:

noun: A sibilant noise (e.g. "psshh") made by birders and ornithologists to attract small birds.
verb: To try to attract birds by making a sibilant noise (e.g. "psshh").
verb: To express contempt.
adjective: (vulgar, colloquial, chiefly Scotland) Of poor quality; very bad.

(Definitions from Wiktionary)