Double Digit

Once a girl ass has reached size 10 or higher.

Do you have that in FAT for my double digit super sized ass?

it was on

Past tense of "it's on. "

Usually said to mark the beginning of a competition or skirmish of some sort, possibly of a spontaneous or unexpected nature.

The two breakdancers briefly sized one another up, but then the beat started, and it was on.