Although this can mean what you think it means, it can also refer to the consumption of discolored semen which occurs because of an infection. Both the discoloration and consistency of the semen form the gravy half of the phrase.
After all that kinky shit, I couldn't help but give my wife a gravy chaser.
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.