Slang for "Go on Then."
Man 1: "I'm gonna nip shop and get some beers before the football starts."
Man 2: "Gan Then, hurry up!"
Gan is an abbreviation for the word goofy ass nigga which is self explanatory
Timmy: *does something goofy*
Zach: “Damn u a gan!”
When your stupid and misspell Gabe like a noob
Person1: Hi Gan how are you
Person2:You are a disappointment