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Literally means "Good Day", a common Australian informal greeting.
G day Chris, whats crackin?
G day by Goyds November 9, 2007
march 9th is the day after international women's day. the day was created to counter international women's day. the letter g has always been the most popular letter in the entire english alphabet. happy g day!
g day by today is g day March 9, 2021
G-Day is the Birthday of a Thug or Player
Yo make sure you text up Jack and wish him a good G-Day before we go out and slay some hoes
G-Day by Jack Davidson March 18, 2015
A way of saying good day in Australian slang.
g’day by MasterAssassin13 March 6, 2018
a slang term used as a substitute for good day. This term is the greatest word ever invented by Australians!
G'day mate, hows it goin? Wanna hit up the pub tonite and drink another keg?
g'day by twangos flaming budds July 21, 2003
ausie contraction for good day, same as hello or sup, greeting
g'day by Big White November 11, 2003
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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