ciaossu 

"ciaossu" means "ciao" from italy and "ossu" from japan,

Its a way to say hi

From the Manga and Anime. Katekyo Hitman Reborn!

Ciaossu. Have you been taking good care of Tsuna around here? ...

ciaossu by Gokudera August 7, 2008

Ciaossu 

Ciaossu mean "chaos". But in Japanes they say "Kaossu" (or something like that) Reborn use "Ciaossu" because he is kid and he does not pronounce correctly. "Chaos" is Adult Reborn saying.

Ciaossu. Have you been taking good care of Tsuna around here? ...

Ciaossu by Tsuna-Kun June 22, 2019