When an animal, usually a dog, surprises you by unexpectedly sticking their tongue in your mouth. It usually happens so fast that it's over before you realize what just happened.
Eww, the dog just coinslotted me after licking his butt!!!"
A strict Vanilla sexual, the Coinslotter is a term used in the Teambang world for someone who sticks to vaginal penetration and switches with the Paychecker of the group to keep the woman entertained until the Paychecker can climax.
It was my first time at a Teambang, so I only played the role of Coinslotter.