When an otherwise straight
male is persuaded to, or on a whim in the heat of the moment, engages in a homosexual act of which he
later regrets and is ashamed.
Alluded to in the musical number of the same name in Mel
Brooks' film "Blazing Saddles".
Having shared the intamacy of a
small tent for so long, in the stress of
jungle combat, Pierre and
Gustav came close to making the French Mistake on many a steamy night.