When two male parties consciously decide to switch female companions at a finite point in the evening.
Jonathon was macking on Susan Friday night. However around midnight there appeared to be a Cincinnati switch as his friend Esteban moved in for Susan, and Jonathon decided to game on Susan's friend Mary whom Esteban was previously chatting with.
When a woman tries to drunk rape you. You stick a lit stick of dynamite in her vagina and yell "Cincinnati Switch!" and jump out of the nearest window.
Colleen was being a bitch so i pulled a Cincinnati Switch