DODMAN

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origin unknown;
a connection with dod (n.) a rounded summit or eminence (dialect), has been suggested;
also see the Wikipedia entry for DODMAN

From: Kynge Johan:
A Play in Two Parts, John Bale 
Edited by J. Payne Collier, from the Manuscript of the Author
in the Library of His Grace The Duke of Devonshire (1838)