a dime, chick, bitch, or ho who is not wanted and "tags along" with her friends
Dre brought four dimes and a tag along nickel up in dis mothafucka.
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to go somewhere with a person or group, usually when they have not asked you to go with them originally
Kate was the tag along on a family vacation instead of the boyfriend.
A person who is a replacement for an individual, usually when they were not in the original plan
Kate was the tag-along on the vacation even though it was supposed to be the boyfriend.
When someone is your replacement.
When Kate goes as your boyfriends as a tag along on vacation.