cinnamon whirl
One person takes a shit in a toilet and begins o spin it with their hand. Their partner then attempts to catch it in their mouth while the other begins to bugger them. If the partner is successful in catching the "cinnamon whirl" then they swap places.
"hey has anyone seen matt"
"I heard he was trying to catch Sandy's cinnamon whirl"
"I heard he was trying to catch Sandy's cinnamon whirl"