Lacking in penis length, not well-hung, deficient. In a recent and highly un-scientific survey, seven out of ten adult American males would rather be called "harmless" than "underhung."
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"'Harmless' -- well, that could be someone who is well-behaved around women, but 'underhung' -- you've been typed for good!"
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by al-in-chgo March 3, 2010