Whomping Melvin
verb. When you take a long hard shit, freeze it, shove it into your girlfriend's vagina while she is on her period, remove it, ejaculate on it, then freeze it again. Remove this period blood cum covered shit from the freezer and serve it for dinner to your in-laws at the next holiday dinner, preferably Christmas dinner.
I don't think I left a good impression on my girlfriends parents when I did the Whomping Melvin