► 成句何だか  [(1)なんだか]  [何+だ+か]  [coll]    
meaning:  somehow  rank: 2☆ この
曲を
聴くと何だかいい
気分になる ⇨ I somehow feel better when I listen to this song
☆ 何だか
変な
音がする ⇨ There is some weird noise
More examples:- 皆がワーワー騒ぐので何が何だか分からなかった ⇨ Everybody was yelling at the same time and I couldn’t tell what was going on
 - 何が何だか良く分からない ⇨ I don’t really understand what is what. I don’t know what is going on