A slug is like a teaser that summarizes a show. Not typically used in anything other than news TV and radio, but occasionally seen in entertainment. Example:
For syndicated shows, the slug may be a short episode synopsis that the local station gets in the syndication deal. The local station will tack on a card at the end showing the time the show will run. Example:
as Bobby gets a new pet!" Bobby:"
"Mom look what I got!" (canned laughter
) Syndication Voiceover:
"On the next Show X!" Local Voiceover:
"Tonight at 5 on Station X!"
Related to Tonight Someone Dies
Websites, news and blogs in particular, use a slug for a mnemonic URL for content. For example this exact TVTropes page's slug is TheSlug.