Wiktionary
n. (context plurale tantum chiefly ironic or humorous English) ominous pawns of evil forces.
Wikipedia
Winged monkeys (often referred to in adaptations and popular culture as flying monkeys) are fictional characters created by American author L. Frank Baum in his classic children's novel The Wonderful Wizard of Oz (1900). The winged monkeys are just what the name implies: jungle monkeys with powerful bird-like feathered wings attached to their shoulders which allow them to fly. They are most notable from the famous 1939 musical movie by MGM. Ever since, they have taken their own place in popular culture, regularly referenced in comedic or ironic situations as a source of evil or fear.
Usage examples of "winged monkeys".
The leader of the Winged Monkeys flew up to her, his long, hairy arms stretched out and his ugly face grinning terribly.
For a moment, he thought he was in The Wizard of Oz, looking at winged monkeys--then he saw the faces and realized he'd done the monkeys a grave injustice.
And here is where the Winged Monkeys captured and bound us, and flew away with little Dorothy,”.
Journalists descended upon our little town like those winged monkeys in The Wizard of Oz.
She said it the way the Wicked Witch of the West said it to the winged monkeys when she sent them out to kill Dorothy and her little dog, too.
On the way Dorothy and her buddies are attacked by the winged monkeys, who represent (very subtle metaphor here) the plains Indians.