Tunefox
The Clever Way to Learn & Practice Bluegrass Music
These tags are not what you do when someone is "tagging" a vocal tune. That kind of tag is where you repeat the last line of a song or a piece of the last line, before ending it. These tags are what people typically play at the end of a fiddle tune or instrumental.
The first tag for this is the typical Shave and a haircut. If you explore the licks you'll find other options for how to end a tune using only one tag. When using the more complex first tags people will sometimes add a second tag that follows that. The second tag is almost always the "shave and a haircut" or something that closely follows that rhythmic pattern.