The 'dirty dragonball-z' is when you, right before cumming, yell out
1. "This isn't even my final form"
Proceeding to yell at the top of your lungs, trying to achieve a higher power level.
2. "EART GIVE ME YOUR STRENGTH"
Slam, as hard as you can, your finger (or more, depending on looseness) up your ass, and smear whatever 'energy' comes out, on your dragonballs.
2. cum in her, and force her around
3. teabag her (of course trying to aim for the upperlip for the sake of the origins definition.
ill give you an example of the dirty dragonball-z at my place