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A sexual act involving three dicks being inserted into three holes. While possible between humans, the act was designed for a kangaroo and three monkeys, as kangaroo females have three vaginas and monkeys are flexible.

Originated from Seussical the Musical, which features a kangaroo and three monkeys named the Wickershams battling some obvious sexual tension.

Doesn't have to be rape, but it helps.
The wickersham brothers saw the sour kangaroo and decided to Wickerslam her.

Jack: Hey, see that girl over there?

Alan: With the pocket on her chest?

Sean: She looks like a kangaroo.
Jack: I have the sudden urge to wickerslam her...
by The Whole Tiddie April 20, 2017
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