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.
A man or women, unmarried, and living like a house wife or house husband. A house mouse is very pampered and well cared for, in exchange for this the mouse takes care of the house and anything elts to keep master happy.