Green’s Dictionary of Slang

(US) the spoken version of the graphic symbol / used to connect two phrases.

2014		C. Eble UNC-CH Campus Sl. Spring 2014 13: SLASH — spoken version of the graphic / to connect any two phrases: ‘Are you making cookies slash call me when you’re done.’ ‘I need to study slash I don’t want to get off of Facebook’.
2019		D. Jenkins Reunion 16: [T]he blond quarterback-slash-surfer, Shea Luckett.