The phrase "9-oclock woman" is a slang term used in the context of porn videos. It refers to a woman or female character who is portrayed as being more open and willing to engage in sexual activities at night, specifically around 9 o'clock. This can be interpreted as a woman who is more adventurous, passionate, or eager for sex during this time of day, which is typically associated with people being more relaxed and free-spirited after work hours.