peen

Etymology 1

Probably from a North Germanic source, compare dialectal Norwegian penn (“peen”), Danish pind (“peg”), German Pinne (“the peen of a hammer”), Old Swedish pæna (“to pound iron with a hammer”).

noun

1. The (often spherical) end of the head of a hammer opposite the main hammering end.

verb

1. To shape metal by striking it, especially with a peen.

Etymology 2

Clipping of penis, with the spelling changed to maintain the original pronunciation.

noun

1. (slang) Penis.
   With all due respect (and that may be very little), the real truth is that being a dad is sometimes an imposition of pain far worse than any up-the-peen catheter could ever deliver. 2009, Danny Evans, Rage Against the Meshugenah: Why it Takes Balls to Go Nuts, New American Library, published 2009
   Where to touch a man that will drive him wild every time (Hint: It's probably his peen.) 2010, Andrea Lavinthal, Jessica Rozler, Your So-Called Life: A Guide to Boys, Body Issues, and Other Big-Girl Drama You Thought You Would Have Figured Out By Now, Harper, published 2010, page 32
   It's so quiet you could hear a peen go soft. 2012, Fanny Merkin, Andrew Shaffer, Fifty Shames of Earl Grey: A Parody, Da Capo Press, published 2012, page 49