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.
Whenever I'm out of town for business after I check into the hotel and put my stuff away I go down to the front desk and ask where the local wankershame blvd is.