ménage à moi

Etymology
.

Noun

 * 1)  Masturbation or an act of masturbation, especially by a woman.
 * 2) * 2020 April 16, Lucy Jones, The Independent.
 * "en"
 * "en"

- Wever’s character, aroused by the situation, goes to the train bathroom for a quick, no-nonsense menage a moi.