To insert one‘s penis into the rectum of another person for the purpose of sexual copulation, an act commonly shared and enjoyed between homosexual males.
Patrick and Jacob are gay boys and they like to butt-fuck. I know because when I caught them naked togetherone time, and Patrick had Jake bent over and I could see that he had his penis balls-deep up Jake's ass!
To slam your large member deep into the rectum of your girlfriend, vigorously gliding it in and out of her puckered anus over and over and over until you gush a huge glob of your thick ball batter DEEP into her gut. Probably the greatest joy known to man.