Answer:

hoots

Answer	Crossword Clue
HOOTS	Owl cries
HOOTS	Heckling sounds
HOOTS	Sounds from wise guys?

HOOTS	Expresses displeasure
HOOTS	Does owl impressions
HOOTS	Owl calls
HOOTS	Owl sounds
HOOTS	Night birds' calls
HOOTS	Nocturnal forest sounds
HOOTS	Night sounds
HOOTS	Screech owls don't make them

HOOTS	Hostile calls
HOOTS	Hecklers' shouts
HOOTS	Talks like 18-Acrosses
HOOTS	Night calls
HOOTS	Caterwauls
HOOTS	Night noises
HOOTS	Catcalls
HOOTS	Sounds like an owl

HOOTS	Evinces displeasure
HOOTS	Derisive cries
HOOTS	Owl's howls
HOOTS	Owl on "Sesame Street"
HOOTS	Jeers from the jaded.
HOOTS	Things of no value.
HOOTS	Bird calls.
HOOTS	Bird sounds.

HOOTS	Nocturnal sounds.
HOOTS	Noncomplimentary sounds
HOOTS	Shouts from the bleachers.
HOOTS	Boos.
HOOTS	Barn sounds
HOOTS	Night tree sounds
HOOTS	Owls' sounds
HOOTS	Sounds of owls and unhappy audiences

HOOTS	Apes owls
HOOTS	Hollers' companions
HOOTS	Jeers
HOOTS	Owls' calls
HOOTS	Says "to-whoo"