A website's relevant value as determined by the Google
search engine. The more "juice" a site has, the more likely it will turn up in search results. This is especially true when the search terms aren't the title of that site.
Google's particular method, known as PageRank, determines this importance according to who links what. If a high-ranking site links to a low-ranking one, that site will be given lots of juice. If a low-ranking site links to something, it doesn't have as much relevance. The text of the link also is taken into account.
Google Juice is very important in Search Engine Optimization. It's also the cause of cursed things like comment spam
, link exchanges
, and link blogs
. This is collectively called spamdexing
Fark linked me the other day and I got a ton of Google Juice. Now I'm the top result for "elderberry fisting gambit".