From Wiktionary, the free dictionary
Literally, “he heard the (bell) sound but doesn't know where it is”.
- IPA(key): [ˈsɫɨʂəɫ ˈzvon | ˈda nʲɪ‿ˈzna(j)ɪt | ˈɡdʲe ˈon]
слы́шал зво́н, да не зна́ет, где о́н • (slýšal zvón, da ne znájet, gde ón)
- (idiomatic) someone doesn't know what he is talking about