That's how Latvians greet each other informally.
by lolmmmmm May 17, 2021
(In Translation: oh hey) Ale čau is a Slovak catchphrase meaning ''Oh Hey!'' or ''Well Hi!''. The Catchphrase was popularised by the popular Slovak youtuber Duklock, it quickly spread as a joke among Redditors and soon became a recognisable meme.
by Yūno November 16, 2018