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Chapatsu is a common Japanese hairstyle that involves bleaching and/or dying one's hair.

Chapatsu (which translates to “brown hair”) can be commonly seen among teens, especially teens that dress in Ganguro, Kogal, and makeup styles, and is often used to accentuate tan skin.
With that skin tone she'll never look good in chapatsu.
by Some gaijin. December 08, 2010