The act of many cheggs leaving a location together. If you consider the Brits, "Cheggs" (we don't) then brexit would be a form of Cheggxit. But it could be a smaller group of cheggs. Chegg definition in this case refers to people with no concept of societal norms and common sense.
Gonzo - Yo Splooge, where did all the cooks go?
Splooge: Yo Gonz, as soon as they heard Jimmy was bringing a Jdog out back of the restaurant, there was a mass cheggxit
Cletis : Hey Cooter, did all of the new weed order get put away tonight?
Cooter : Nah Cletis, everybody f'ed off early and left all the work for us; just a brutal cheggxit.