noun
fishing nut; fishing enthusiast
Colloquial term for someone obsessed with fishing; often used in a lighthearted or self-deprecating way.
彼は休みのたびに釣りに行く、本当に釣りバカだ。
He goes fishing every time he has a day off—he's a real fishing nut.
釣り好き is a neutral term for someone who likes fishing, while 釣りバカ is more colloquial and implies an excessive, almost foolish passion.
Compound of 釣り (fishing) and バカ (fool). The term likely arose from the idea of being so obsessed with fishing that one appears foolish.