When a gang member or affiliated person represents (jacks) two different gang sets. An example of this would be OYs and OGz in the Bronx, New York, who often throw up OY OGz even though they are two completely different gangs.
A fat chic being penetrated by two men in the ass and vagina. Since she is fat and usually disgusting, but willing,the men work fast to get it over with.
Fat susanask bragged about her doublejacking. Shes been much happier ever since.
The ability girls and women have developed to hold several items at once in one hand. The skill has been developed due to the lack of pockets in women's clothing.
I thought she'd need multiple trips to carry her phone, keys, wallet, and Starbucks to her car since she needed the other hand to open the door, but she used her impressive girl grip to carry everything in one hand.