Etymology
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hee-haw

also heehaw, attested by 1815 (as Hiu Haw), probably imitative of sound of donkey's bray (compare French hinham). As "a loud laugh" from 1843.

updated on January 23, 2019

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Definitions of hee-haw from WordNet
1
hee-haw (v.)
braying characteristic of donkeys;
Synonyms: bray
2
hee-haw (n.)
a loud laugh that sounds like a horse neighing;
Synonyms: horselaugh / ha-ha / haw-haw
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.