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A fake Facebook account you make when you're too lazy to keep your real one clean. You use 'Pukcab' instead of your real last name because Facebook won't let you say 'Backup' anywhere, and you're too good for their stupid rules.
My main account got banned for swearing too much. My Pukcab account is the only one I can post on without getting yelled at.
I made my Pukcab account just so I could post that embarrassing photo from middle school without my mom finding out.
When my main account got deleted, I had to use my Pukcab one to log in and save my life.