the braying sound made by a donkey.
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How to use heehaw in a sentence
From somewhere just out of their view had come the loud heehaw, heehaw of a donkey.A Ticket to Adventure | Roy J. Snell
British Dictionary definitions for heehaw
an imitation or representation of the braying sound of a donkey
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012