Definition of tagger:
(n) :
The player who tries to catch others in the game of tag.
(n) :
One who or that which tags.
(n) :
A person who writes graffiti using a specific mark
(n) :
(computing theory) A program or algorithm that adds tags for purposes of categorization, e.g. grammatical information to words in a document, or genres to songs in a music collection.
(n) :
A device for removing taglocks from sheep.
(n) :
That which is pointed like a tag.