Self-spanking is the "You go, girl!" of masturbatory gestures. It's sassy, boastful, and it lets the whole world know that your booty is so delightfully spankable that it's a crime for it to go unspanked, a crime that you are narrowly avoiding with the generous act of spanking yourself. You're a hero.
And nothing drives the point home like a little additional gripping and shaking with the spank. It doesn't matter if it comes before or after the slapping portion of the gesture, but we prefer it before, that way the whole message is: "[Ass grab] Yeah this is meat; [spank!] my meat." There! Now you know a little bit of pornographic sign language.
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