It's an analogy concerning the navigation on your website. A spider, when crawling your website may find bumps and walls that prevent her from crawling your website correctly (as if you were driving and hitting bumps and walls)
"Complex links and deep site structures with little unique content may serve as "bumps." Data that cannot be accessed by spiderable links qualify as "walls."
read the rest of the article on seomoz here
P.S: Type SEO speed bumps and walls in Google, magically, this article shows #1.
Do your homework. Look for the information.
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