To lick ones asshole, man on man ,man on woman, woman on man, woman on woman. One takes there Tung and licks around the edge or rim giving it the word rim job. Also you can stick your Tung up in the asshole as far as you can and tickle the inside walls of the asshole. Personally I love giving and receiving a rim job
Boy my wife gave me the best time job I ever had I never new she was capable of doing it not only does she love receiving one she also loves giving me one
Rim job means to lick ones asshole around the rim that's where rim job comes in, but it was later learned that sticking the Tung up in the asshole as far as you can and tickle the walls of the asshole was even more pleasure ,Early on it was believed to be a homosexual act but it's well known now that it's enjoyable for all sexual orientation gay or straight.
The act of treating a coffee cup, belonging to someone other than yourself, to a swipe of the dick around the rim, both sides. This makes the act of drinking from the cup like putting your cock in the coffeedrinker's mouth.