An argument; a value passed as a parameter.
"The ARG about the mysterious cult gained a massive following online last summer."
Initialism of alternate reality game.
In plain English: An arg is an argument or disagreement between people.
"They had no time to argue about who was right during their busy commute home."
Usage: In everyday conversation, an arg refers to a disagreement or dispute between people rather than the technical programming term for a function parameter. Use this word when describing verbal conflicts, not in software development contexts where it denotes input data.
Expressing frustration or disappointment.
"He began to arg after hearing the bad news about his flight cancellation."