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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!"
by BobbyZ December 19, 2003
anal masterbation
That skank ho was assterbating with her butt plug
by fizgig April 07, 2003