The act of ejaculating on someones dvd copy of either of the two Scooby Doo Movies and then screaming zoinks at the top of your lungs.
Shaggy was beating off a nutt in the mystery machine right onto a dvd copy of Scooby Doo 2 : Monsters Unleashed.
The rest of the gang could hear zoinks being screamed from inside the house.
Therefor Shaggy was Zoinking.
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