Right now meta means the title and description.
- Title – Title of the fiddle will be displayed on your public profile. adding title will also make the fiddle available on your public profile page, normally when that's not set it'll be unlisted (not displayed in Public Fiddles listing, but anyone who has a direct link to the fiddle will be able to access it)
- Description – well, the description of the fiddle. It will be displayed in your public fiddle list.