- -festis a new suffix derived from the German word Fest meaning ‘festival, celebration’. It occurred first in AmE in the late 19c in the word gabfest meaning ‘a gathering for talking’ and spread rapidly to produce other words such as talk fest, shooting fest, liquor fest, etc. It has also spread to BrE in formations such as discofest, filmfest, funfest, rockfest, etc.
Modern English usage. 2014.