The Collaborative International Dictionary of English v.0.48:

Hoot \Hoot\, n.
   1. A derisive cry or shout. --Glanvill.
      [1913 Webster]

   2. The cry of an owl.
      [1913 Webster]

   3. A very funny event, person, or experience; as, watching
      Jack try to catch that greased pig was a hoot.
      [PJC]

   Hoot owl (Zool.), the barred owl (Syrnium nebulosum). See
      Barred owl.

   not give a hoot not care at all.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hoot owl
    n 1: any owl that hoots as distinct from screeching

U.S. Gazetteer Places (2000):

Hoot Owl, OK -- U.S. town in Oklahoma
   Population (2000):    0
   Housing Units (2000): 6
   Land area (2000):     0.062225 sq. miles (0.161163 sq. km)
   Water area (2000):    0.000970 sq. miles (0.002512 sq. km)
   Total area (2000):    0.063195 sq. miles (0.163675 sq. km)
   FIPS code:            36020
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.360034 N, 95.121610 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hoot Owl, OK
    Hoot Owl