Lonely Diver
To stick ones thumb/finger up their asshole for pure enjoyment, but to do it alone.
Guy 1: Man, work went by so slow today, i had to go on break and give myself a lonely diver to pass the time.
Guy 2: Thats fucking gross shit man.
Guy 1: I know!
Guy 2: Thats fucking gross shit man.
Guy 1: I know!