Word Study
hee-haw
CIDE DICTIONARY
hee-haw, v. i.
to bray in the manner of a donkey. [WordNet 1.5]
hee-haw, n.
a loud laugh that sounds like a horse neighing. [WordNet 1.5]
OXFORD DICTIONARY
hee-haw, n. & v.
--n. the bray of a donkey.
--v.intr. (of or like a donkey) emit a braying sound.
--n. the bray of a donkey.
--v.intr. (of or like a donkey) emit a braying sound.
Etymology
imit.
For further exploring for "hee-haw" in Webster Dictionary Online