From Wiktionary, the free dictionary
а́у (áu) + -ушки (-uški, plural of diminutive suffix)
а́ушки • (áuški)
- (regional, colloquial) diminutive of ау (au); huh? eh?
- Synonyms: (vernacular, humorous) ась (asʹ), (colloquial) а́юшки (ájuški)
— Жень! — А́ушки?- — Ženʹ! — Áuški?
- — Zhenya! — Huh?