noun, noun or participle which takes 'suru'
morning shampoo; washing hair in the morning
Casual term for shampooing one's hair in the morning, often as part of a daily routine. Can be used as a noun or with する.
朝シャンする時間がなくて、寝ぐせのまま出かけた。
I didn't have time to wash my hair in the morning and went out with bed head.
最近、朝シャン派と夜
Lately, people seem to be divided into morning-shampoo and night-shampoo camps.