noun
perfectionist; enthusiast; zealot
Describes a person who is deeply absorbed in a hobby or pursuit, often to the point of being obsessive or overly meticulous. Similar to 凝り性, but 凝り屋 can sound slightly more colloquial.
See also: 凝り性 (こりしょう)
彼は凝り屋だから、趣味の道具にすごくお金をかける。
He's such an enthusiast that he spends a lot of money on his hobby gear.
あの人は凝り屋で、何でも完璧にしないと気が済
That person is a perfectionist who can't rest until everything is done perfectly.
Almost synonymous; 凝り性 is more common and slightly more formal, while 凝り屋 feels a bit more colloquial and person-focused.
Compound of 凝り (kori, 'obsession, absorption', from verb 凝る) and 屋 (ya, suffix for a person with a certain trait).