遛弯 is a colloquial Northern Chinese expression meaning 'to take a leisurely stroll' or 'to go for a walk', especially common in Beijing and other northern regions. It's an intimate, everyday word — the kind you'd use when asking a neighbor or family member if they've gone out for their daily walk. The 遛 suggests a relaxed, aimless pace, different from the more standard 散步 (sànbù, 'to go for a walk').