When all five of someone's fingers are used at the same time to pleasure an anus; either their own, or another person. Preferably, the ideal situation of a dirty five is done by full insertion of all five fingers. The name is derived from the more known "high five" but obviously for anal stimulation as opposed to a celebratory action between two individuals. Also known as a D5, one can signal their intentions to another person by putting all 5 fingertips together to simulate the technique required for preferred insertion.
by Brando/s4r4h December 01, 2011