Jacking the Bal by the Sea and Cake is simply a song. However, used in the right context it can be interpreted as some sort of bizzare sexual innuendo that no one gets.
Me: jacking the ball by the sea and cake
Me: get it you must
insufferable mulct: i've never heard that one, but i'm going to guess handjob.
Me: LOL
Me: I hope you're kidding
Friend One: That kid just moved away.
Friend Two: Let's make him jealous and ballsack his house!
Friend One: Sounds like a plan... let the ballsacking begin.
Takes some luck of the gene pool, but if you're able to do it, always great fun. While you are straddling her, take your nutsack and spread it out over her face like pizza dough.