Definition of squawker:
(n) :
A person who complains or protests noisily.
(n) :
Something that squawks.
(n) :
(slang) An informant; a stool pigeon.
(n) :
(slang) The radio used in police vehicles to keep in contact with headquarters.
(n) :
A loudspeaker used for frequencies intermediate between those of a woofer and a tweeter.