笨笨笨笨笨丫头坏坏坏坏坏小子
[bèn bèn bèn bèn bèn yā tóu huài huài huài huài huài xiăo zi]
It is playful, referring to someone, often a girl ('丫头') being somewhat silly and someone else, typically a boy ('小子'), mischievous. The repeating words enhance their characteristics described by the terms.