being crazy about something despite being bad at it
Almost exclusively used in the proverb 下手の横好き (へたのよこずき), describing someone who loves doing something but is not skilled at it. Often used self-deprecatingly or humorously.
See also: 下手の横好き
I'm a classic case of 'being crazy about something you're bad at' — I love golf even though I'm terrible at it.
His cooking is a labor of love despite his lack of skill; he enjoys making it regardless of the taste.
Compound of 横 (side, wrong) and 好き (liking). The exact origin is uncertain, but it likely developed from the idea of a 'misplaced' or 'off-target' fondness, i.e., liking something one is not good at.