It is short for "Good afternoon" It is informal and used only in certain areas. However it is becoming more widespread.
"Mornin'", and "Evenin'" can be used as well. Notice the missing g. Colloquial usage.
There is no Antarctic language. One would say 'good afternoon' generally, and have it acknowledged as an afternoon greeting.
'Konnichiwa.'
"Konnichiwa" is the Japanese greeting that translates as "Good afternoon".
'Good afternoon' is typically used as a greeting from 12:00 PM until around 6:00 PM. After 6:00 PM, it is more appropriate to use 'good evening'.
In the Bahamas, you can say "Good afternoon" by using the phrase "Good afternoon" itself or by saying "Good day" as a more casual greeting.
"Gutentoch" is an informal Yiddish greeting that means "good day" or "good afternoon." It is a variation of the more common Yiddish greeting "gutn tug," which means "good day."
"Konichiwa" means "good afternoon" in English. It is a common Japanese greeting used during the afternoon and early evening.
There is no "good afternoon" formula in French to greet people, only one for when you are leaving. As a greeting, it is standard to use "bonjour", until the evening. You will use "bonsoir" then. When you are departing, you can use "bonne journée" (for the whole day ahead), "bon après-midi" for the rest of the afternoon, or "bonsoir / bonne soirée" when leaving in the evening.
There is no particular equivalent word in the same sense in Hindi for good afternoon as most Indian languages don't use greetings which change according to the time of day. You can use common greeting Namaste or namaskaar at any time of the day.
The custom greeting for the US is typically "Hello" or "Hi" followed by the person's name or a general greeting like "Good morning/afternoon/evening." It is common to use polite and friendly language when greeting someone in the US.
"Konichiwa" is a greeting in Japanese which means "hello" or "good afternoon".
There are two languages in Canada. Most people there speak English, so "good afternoon" would be right. For the French speakers, "bonjour" (good day) would be right.