A vacation.
"The technician used an oscilloscope to measure the vac of the transformer before connecting it to the circuit."
Initialism of volt of alternating current.
In plain English: Vac is short for vacation, which means taking time off from work or school to relax and have fun somewhere else.
"I need to put my clothes in the vac to clean them before packing for vacation."
To vacuum; to clean with a vacuum cleaner.
"She spent an hour vacing her carpet before guests arrived."
In plain English: To vac means to leave a place quickly and completely, usually because someone else is taking over that space.
"I need to vac my bedroom before the guests arrive tonight."
Usage: Use this informal verb when referring specifically to cleaning floors or upholstery with an electric device, rather than the more formal noun form of the same word. It is commonly heard in casual conversation but should be avoided in professional writing where "vacuum" as a verb remains standard.
Initialism of Velvet Acid Christ.
"The fan forum was flooded with speculation about the new album by vac, short for Velvet Acid Christ."