American Heritage Dictionary
(2)
Century Dictionary
(2)
GNU Webster's 1913
(2)
WordNet
(1)
Elsewhere on the web
How can you say that a sledgehammer is better than a ball-peen hammer?— Erin McKean redefines the dictionary
But the profile view looks like some scrub brush in the peen area.— Dlisted - Be Very Afraid
Maybe this little event will help wake people up to the fact that their "friend" status on some people's page isn't worth all that much, and social networks can go back to being actual social networks, instead of being an extension of high school drama and an e-peen contest.— Original Signal - Transmitting Digg
Why not just take a ball-peen hammer and hit me with it already!

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You can expect to see this word about once a year.
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