What is the meaning of the metatag "slurp"  ( meta name slurp noydir )

Yahoo's NOYDIR Opt-Out for Yahoo Directory Titles & Descriptions

Search Engine Yahoo! supports the use of the metatag ‘NOYDIR’ . It might have been some time since your website was submitted to the Yahoo Directory. Maybe it shows an old title or a wrong description. If you want to force Yahoo! to revisit your website and publish the new title and description tag, use the NOYDIR metatag.

The Yahoo Directory has been compiled by humans and may contain information you don't want to be shown. Overall Yahoo’s directory consists lots of old information.

the solution to this problem is simple : just add the next metatag on every page :

<meta name="robots" content="noydir">

This metatag tells every search engine spider NOT to use the title or description tag found in the Yahoo Directory. Now you are able to determine yourself what the title and description tag is that is shown in the search engine's index so you are able to influence the CTR. And this is very important for the ranking of your website. 

If you want to make sure that Yahoo doesn't show the Directory description add the following:

<META NAME="Slurp" CONTENT="NOYDIR">

A metatag that has a similar action is the NOODP meta tag. The report of old information originates your submission in the Open Directory Project DMOZ. The website, with the old meta description, has information and a link in the ODP listings (Open Directory Project). If you want to make sure that all search engines know that they shouldn't publish this old information, you add: 

<META NAME="ROBOTS" CONTENT="NOODP">

To block ODP and Yahoo just use:

<META NAME="ROBOTS" CONTENT="NOYDIR">
<META NAME="ROBOTS" CONTENT="NOODP">

Sometimes people want to make sure and tell all spiders individually:

<META NAME="GOOGLEBOT" CONTENT="NOODP">
<META NAME="SLURP" CONTENT="NOODP">
<META NAME="MSNBOT" CONTENT="NOODP">

Also adding this tag will work:

<META NAME="ROBOTS" CONTENT="NOYDIR,NOODP">

If you also want to block archiving, just the following tag :

<META NAME="ROBOTS" CONTENT="NOYDIR, NOODP, NOARCHIVE">

Meta tags and the Slurp Noydir Summary - Important SEO things to remember
Search Engine Yahoo! supports the use of the ‘NOYDIR’ Meta Tags. Your website might be found in their directory and shows an old title or wrong description. If you want to force Yahoo! to use the new title and description tag, use the NOYDIR metatag. This metatag can be placed on every page of your website. Read why meta tags are important and how they affect the search engines. Use our meta tags generator to create the correct meta tags. Use our website analyzer to get professional advice from the meta tags experts. Submit your website to the search engines and choose one of our packages:
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Tags: meta, name, slurp, yahoo, noydir, meta-tags