A pervert exposed himself to a woman in Morningside Park — but fled with his tail between his legs when the plucky victim turned the tables and took a swing at him, cops said Thursday.

The 38-year-old woman was strolling along a path in the park between West 120th and West 123rd streets around 7:40 p.m. Tuesday when the creep sneaked up behind her, lifted her skirt and flashed her, authorities said.

The quick-thinking victim swung at the deviant, sending him fleeing into the park, police said.

Investigators released this sketch of the suspect, who’s believed to be between 18 and 25 years old, 6 feet tall and 180 pounds.

He has hazel eyes and was last seen wearing a white T-shirt, gray sweats and white sneakers.