4 guys in line. Guy
in the back of the line inserts a buttplug into his own ass and his thumb into the ass of the guy in front of him whilst
masturbating. That guy does the same to the gentleman in front of him, and so on
down the line. The guy in front of the line is in charge of the speed and tenacity of the group. He may also call out cadences. "Feel the rhythm, feel the rhyme. Let's all get off, it's bobsled time!"