memphis meat tenderizer
When a man places his erect penis on a solid surface, typically a counter top, and his lover repeatedly slams their forhead on the engorged member until said member is flaccid. Also used to treat erections lasting more than four hours.
I popped a viagra and my dick was still hard four hours later, and thank the lord my tranny girlfriend knew of the memphis meat tenderizer, therefore avoiding a trip to the emergency room!