An ongoing conflict or rivalry with another person over a game, or series of games of Monopoly (the real estate trading game).
"Why don't you play Monopoly anymore?"
"Steve and Jane have been in a Monopoly vendetta for six months and I got sick of being put in the middle every time I play"
"Steve and Jane have been in a Monopoly vendetta for six months and I got sick of being put in the middle every time I play"
by squeecakes June 2, 2009