An entertaining, usually light-hearted and family-friendly movie you watch while curled up in a dozen or so blankets (covers--hence the term) that requires little to no logic to understand, is likely a childhood classic and which brings back memories of the good old days.
see article: www.filmcrusade.com/what-is-a-cover-movie/
Frost-bitten and shivering from shoveling snow, goosebumps-laden Andrew went inside his cozy home, removed all of his clothes, asked his mother to make him some hot chocolate and immediately popped in a cover movie -- Back to the Future -- before diving into a mountainous pile of covers and falling asleep. Needless to say, when school was canceled the next day, Andrew had a lineup of quality flicks prepared for a day's long of cuddling - Sandlot, Home Alone and The Goonies.
The next day off from school he watched It's A Wonderful Life, followed by Masters of the Universe and Ernest Scared Stupid. He fell asleep and passed out before getting to Billy Madison or, his next choice, Revenge of the Nerds.