the.com/sayonara

means A farewell used in English to signal a final, often theatrical, departure from something or someone.

from Borrowed directly from Japanese 'sayōnara' (さようなら), itself a shortening of an older phrase meaning roughly 'if that is how it is to be' — a resigned, formal way of parting. It entered English largely through postwar American contact with Japan, especially via servicemen and pop culture, and quickly drifted from its gentle original tone into something snappier and more flippant — the word you say while slamming a door rather than bowing politely.