when one takes a shit/diarrhea in their bed.
After McKenzie questioned the smell of the room, Colleen confessed to a nasty bout of number 6.
A stunning blonde who plays several key roles in Cylon society. She is the first humanoid Cylon that viewers witness in the re-imagined Battlestar Galactica. She is portrayed by actress/model Tricia Helfer.
See that blonde over there? She could be my Number 6!