When performing sex with a woman that has a nicely formed ass, in doggie style position, every pounding thrust causes her ass to jiggle back at you, therefore enhancing the back and forth movement.
The act of Jungleballing is to interfere with a friends love interest by swooping with the intent of sparking your own romance between your friends romantic interest and yourself. Common rules of friendship etiquette are generally disregarded.
Example 1:
Cache: "My good friend Tanner is in to Natalie, but I think we would be a better match. Therefore, I am
going to flirt with and ask her out if I get the opportunity."
Beth tells her friend Megan she is into Josh. while Beth is out of town, Megan gets Josh to come back to her house so they can hook up. Megan jungleballed Beth.