Masturbating analy. Fingers or the daring fist(s). More unique rituals include feet and possibly penii (penis plural).
For more asstastic fun, see poopy chopsticks
"Oh man that assterbation was awesome."
"yea my foot is brown!"
Drunken Party Game; Take turns taking chopsticks to each other anus's, searching for the peice of feces containing the most undigusted food stuffs. Loser eats.
Jonny lost, now he has poo on his foo man shoo.