(n.) 'dA-&s-"eks-'vä-gi-n& An unexpected, artificial, or improbable instance of two or more individuals having sex introduced suddenly in a work of fiction or drama to resolve a situation or untangle a plot.
"...so, her boyfriend found out he had brain cancer, their dog was hit by a car, and the bank finally foreclosed on the house. But then they had sex, and all of their problems were immediately solved!"
"Sex... cured the brain cancer, got them a new dog, and somehow supplied them with a hundred and fifty thousand dollars?"
"Yeah, it was a bit of a deus ex vagina."