斗牛 (dòuniú) literally means 'bullfight', but in Chinese basketball slang it has come to mean a casual streetball game — the chest-banging, no-foul-calls vibe matches the name.
一对一斗牛 specifies the 1-on-1 format; you'll also hear
三对三 (3-on-3) and
全场 (full court).
