noun
shiny bald head; person with a shiny bald head
Colloquial and slightly humorous term for a completely bald, shiny head or the person who has one. Often used in casual, teasing, or self-deprecating contexts.
おじいちゃんはつるっぱげで、いつも帽子をかぶっている。
Grandpa has a shiny bald head and always wears a hat.
彼は若いのにもうつるっぱげだ。
He's already bald and shiny-headed even though he's young.
From つるつる (smooth, slippery) and はげ (baldness), with the つる reduplicated and geminated for emphasis. The exact derivation is uncertain, but it is a colloquial compound.