hackfestEnglishOxford New American Dictionaryhackfest /ˈhakˌfest, ˈhækˌfɛst / ▸ noun informal 1 an event or gathering dedicated to sharing information about computer programming and software development: an annual computer hackfest in Vancouver. 2 a period of frenzied violence, particularly in a film, book, or video game: a gruesome hackfest. ▪ a sporting event involving rough play or an excessive number of fouls: you just know before the game starts that it's going to be a hackfest.