1 definition by ihatepickingnamesout54321

Top Definition
When a person's thumb:
1) has a hammer related injury
2) is unusually wide and stumpy
I just hit my thumb with a hammer today. This hammer thumb makes me feel like an clutz.

"Have you seen Susie's Hammer Thumb?"
"Ya, they're unusually wide and stumpy!"
by ihatepickingnamesout54321 May 10, 2010

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