A ball-busting female boss at a Brooklyn precinct is under investigation for allegedly stuffing a pair of her panties into a male colleague’s mouth, police sources told The Post on Monday. Sgt. Ann Marie Guerra, the second-in-command at the 72nd Precinct Detectives Squad, flipped out on Detective Victor Falcon when he complained about her leaving her underwear all over the unisex locker room, sources said. “They are f–king clean!” the 38-year-old married mom of two allegedly roared Oct. 7 — as she shoved a pair of her panties into Falcon’s mouth, a source said. A complaint was filed against Guerra...