Would someone please explain what piggy back is?

In credit i thought i saw what is called piggy backing to get a credit rating, Thank you

Public Comments

1. where you carry someone on your back.
2. it is when someone who is younger gets on your back, while you are holding their thighs and their arms are around your neck... DUUUHHHHHHHHHHHHHH!
3. from what i understand, its where a person with excellent credit allows a person with subprime credit to become an authorized user on their account. or they in essence become a cosigner for a credit card which is never used. the whole purpose is to raise the subprime person's credit to a higher rate faster than conventional methods.
4. Piggybacking is when you allow someone to become an authorized user of your credit in order to boost their credit. It is ILLEGAL!