roshambo
To play a game of roshambo in order to decide a point of contention.
I'll roshambo you for it.
Where it comes from
Unknown. The syllables ro – sham – bo are called out by players to synchronize their timing. Connections to the French surname Rochambeau are a folk etymology, perhaps derived from the vaguely similar Japanese syllables jan – ken – pon.
Adapted from the Wiktionary entry roshambo (CC BY-SA 4.0).