怀念兵荒马乱的小青春
[huái niàn bīng huāng mă luàn de xiăo qīng chūn]
This implies nostalgic reminiscence about youthful days filled with confusion, chaos, excitement, and change—the 'messiness' being a nod to both challenging times but also an irreplaceable era rich in memories and growth experiences during young adulthood.