(pl. "oopsie-dozies")
A nap one does not intend to take; upon waking from an oopsie-dozy, one will often feel crankier and MORE tired than they did before accidentally slipping into the oopsie-dozy.
Sometimes, this can lead to a chain of several oopsie-dozies, otherwise known as an "accidental coma."
After working my eight-hour shift from 5 A.M. to 1 P.M., I came home and while watching TV, I took an oopsie-dozy for a couple hours.