US Rep. Alexandria Ocasio-Cortez is warning Democrats they need to brace for the worst thing imaginable even if Joe Biden is elected — brunchless weekends!

“After we work to command victory in November, I need folks to realize that there’s no going back to brunch,” Ocasio-Cortez said in an Instagram video marking the death of liberal US Supreme Court Justice Ruth Bader Ginsburg on Friday — and referring to the need for Democratic  Party stalwarts not to get complacent over any potential White House win.

“We have a whole new world to build. We cannot accept going back to the way things were, and that includes the Dem Party,’’ AOC said.

“Voting for Joe Biden, it’s not about whether you like him or not, it’s a vote to let democracy live another day,” said the socialist Bronx congresswoman, who has been famously tepid in her backing of Biden.

“No president is the answer. You are the answer. Mass movements are the answer,’’ the pol said.