不长发即腰少年就不娶你了
[bù zhăng fā jí yāo shăo nián jiù bù qŭ nĭ le]
It literally means 'If a boy does not grow his hair to waist-length, he won't marry you'. This playful name suggests the speaker is making a whimsical promise or threat about marriage contingent on an impractical condition, implying an impossible demand or perhaps teasing someone for being immature.