The act placing the tip of your member precisely in the ear cavity of your friend's soon to be girlfriend and "sending in the swimmers". Preferably performed in a public restroom.
When you wrap you finger in toilet paper and insert it into your own arsehole after taking a shit to give it the best possible clean.
Person 1: my girl is going to rim me tonight.
Person 2: make sure you give yourself a good CueTipping first. That will improve your chances of her doing it again.
Person 1: good thinking