blue boar:

Or: blue board , obsolete term for a syphilitic chancre. Captain Grose in Dictionary of the Vulgar Tongue (1811) called it : ' A venereal bulbo .' See syphilis for synonyms.
See Also: baby blue, blue, blue handkerchief, blue-veined junket pump, broad jest, cat call, dark blue handkerchief, dirty joke, light blue handkerchief, locker-room humor, poke pants, pokes

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