noun, na-adjective, noun which may take the genitive case particle 'no'
person who sweats easily; profuse sweater
Describes a person who tends to sweat a lot. Can be used as a noun or adjectivally (汗っかきな人, 汗っかきの体質).
I sweat easily, so I always carry a handkerchief in summer.
He's a profuse sweater; even a little movement makes him sweat right away.
Kanji spelling using 掻く (to scratch/sweat); less common but still seen.
Derived from 汗 (あせ, sweat) + かき (from 掻く, to scratch/sweat) with a geminate っ for emphasis, forming a colloquial noun meaning 'one who sweats easily'.