A Ballpeen is a word used to describe someone saying, acting, or being dumb.
Tom: Man I love eminems new song 'just lose it' dont you?

Tim: You are a fucking ballpeen!
by Joe November 7, 2004
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1) To tap or bang someone just like ballpeen hammer in a sexual sense.
2) To screw or have intercourse
See that girl over there? Id tap that like a Ballpeen Hammer
by mikemcdagger March 11, 2009
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