Therum

To quit and rejoin a group, or club, repeatedly, all the while being an ass to everyone else.

This natural phenomenon has been around since the dwarven days of old. When two men desired anal they would conjoin there anus's and one partner begins by defecating. Once the fecel matter has penetrated the parallel anus the sphincter reacts and takes in the feces and mothers it as if it were its own. Once the anus has acquired its new bounty it relieves its self back from whence it came. Once statrted, the petpetual anal motion can not be stopped or disturbed by any means or this very act would be defying god himself and all life would end.