Slang for the new $100 bill. The blue refers to the blue 3-D security ribbon on the front of the bill.
*Look for a blue ribbon on the front of the note. Tilt the note
back and forth while focusing on the blue ribbon.
You will see the bells change to 100s as they move. When you tilt the note
back and forth, the bells and 100s move side to side. If you tilt it side to side, they move up and down. The ribbon is woven into the paper, not printed on it.