I'm quoted on page 477 of The Routledge Dictionary of Modern American Slang and Unconventional English (Hardcover) by Tom Dalzell (Editor)
1. the penis US, 1967
They had lost all fear of his hammer. Earlier they had teased it mercilessly, using both pairs of hands to stroke the shaft while passing the head from one mouth to the other. Lexy Harper, Bedtime Erotica for Men, p.49, 2006.