1. n. A floppy dolphin has been administered when an unexpecting sleeper is awakened by a sharp slap from a semi-erect penis. The key is a penis that is not fully erect (which would be the billy club), but erect enough to be meaty. The result is a whipping action that can leave a mark.
Andy: Was Paul angry that you gave him a savage floppy dolphin last night?
Nick: Yes he was. In fact, Paul says he and three others will come when I least expect it to give me a flogging of the dolphins