Top definition
When the penis of a man is so small in size, that he lacks a "shaft." There's just balls and then the head. Ballshead. It can also be used to refer to anything that is a huge disappointment, or generally lame.

To correctly pronounce this word, it must be said very rapidly, and in one syllable.
Mary: "So I finally had sex with Steve, and he was ballshead. I can't believe it."
by charlez360 October 23, 2011
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