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you can have two types of thumbs, hitchhiker, or regular. (i guess that is what it is called, there may be some special name I am unaware of) Regular thumbs go straight up, hitchhiker thumbs curve back towards the shoulder, (if you were to stick your hand out to the side and put your thumb up)

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10y ago
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16y ago

A hitch hiker's thumb is when the top of a thumb is bent about 90 degrees back.

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Q: What is a hitch hickers thumb?
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