"to enter the head": for learning to stay in one's head

Kyūjitai form of 亀頭 (“glans penis”)

dandruff

Alternative form of 汕頭 (Suwatō, “Shantou (a prefecture-level city in Guangdong, China)”)

Shantou (a prefecture-level city in Guangdong, China)

Alternative form of 汕頭 (Suwatō, “Shantou (a prefecture-level city in Guangdong, China)”)

Baotou (a prefecture-level city, the largest city in Inner Mongolia, in northern China)

a yakuza member beneath the oyabun and responsible for seeing that his orders are carried out correctly.

scratching the head / ornamental hairpin

to scratch the head