Describes the level of how hot a woman is that you see in the casino. Typically they are truly a 6, 7, or possibly an 8, but because of the high proportion of dongs in the casino, and the low amount of women that aren't over the age of 50, their attractiveness is elevated because of absence of any attractive women at all. This word is more relevant to Midwestern USA casinos than most other areas, but the term can be used all over to describe an area that has a very low amount of attractive women.
"Look at that casino 10 over there. Should I go invite her back to the room?"
"Only if you are a fan of meth and STDs. But you better hurry before I do it first."