noun
wigless head; natural hair
Slang term for a head without a wig, or one's own natural hair as opposed to a wig. Often used in contexts where someone is normally seen wearing a wig.
彼は普段かつらをかぶっているけど、今日は地頭で来た。
He usually wears a wig, but today he came with his natural hair.
noun
intelligence; smarts; comprehension
Slang for one's innate intelligence or mental capacity, often used in phrases like 地頭がいい (naturally smart) or 地頭が悪い (not naturally bright).
彼は地頭がいいから、難しい問題もすぐに理解する。
He's naturally smart, so he quickly understands even difficult problems.