Means to masterbate. The dolphin being pleasure and my masterbating you are riding this pleasure. from old english when english navy men would go to the caribbean and ride dolphins for pleasure after being at war.
Man 1:I thought you were going to call me last night?
Man 2: sorry i fell asleep after riding the dolphin.
The act of riding on a dolphin doing flips and shit, splashing and getting everybody all wet.
I'm riding on a dolphin, doing flips and shit
The dolphin's splashing, getting everybody all wet But this ain't Seaworld, this is real as it gets
I'm on a boat, motherfucker, don't you ever forget