Batgirl knew when she was being cursed at -- swear words were often some of the easiest words to understand in any language. It certainly wasn't the first time she'd been called this particular name.
She sidestepped the flailing of his arm as he lashed out and rolled away. Judging by his stance, he wanted to engage her again in the kung fu style he'd exhibited last time. Batgirl indulged him, mostly because the longer he stuck around to fight her, the less likely he'd be able to escape. The trick was to get him so focused on the former that he would forget about the latter.
All this she decided as the high kick soared toward her head. Easily ducking under it and moving around to the side, she reached out with a high speed slapping motion aimed at his temple.