A male who is able to conduct sexual intercourse for hours on end. Not necessarily hung like a horse, but he knows how to give a girl the ride of her life. He laughs at Viagra commercials, especially the part about a 4 hour erection being a bad thing.
"Thanks, Honey, for letting us use your room the other night. We had a great time."
"Well, I know you had a good time, you Stallion, we could hear you giving it to her all night!"