English
gamejack
Blend of game + hijack.
Proto-Germanic *gamaną ‘amusement, pleasure’
Proto-West Germanic *gaman ‘pleasure, fun, amusement’
Old English gamen ‘sport, game, pastime’
Middle English game
English game
Today it means
verb To create third-party material that disruptively presents itself as being part of an ARG.
Language periods are conventional ranges, not dates for this word.
Etymograph / gamejack