What is the slang term for LaTeX?

Slang term for LaTeX depends on whether you mean natural latex or LaTeX typesetting software. For natural latex material, slang terms include rubber, rubbers, latex, and for condoms slang is rubbers. For LaTeX typesetting software, there is no widely used slang term, people just say LaTeX, pronounced lay-tech or lah-tech, sometimes jokingly called lay-tech. In academic circles, people might say Tex, as in TeX or LaTeX, or refer to it as markup language. Some humorously call it torture system because of steep learning curve. For latex clothing, slang includes rubber, latex fetish wear sometimes called rubber wear. So there is no official slang term for LaTeX software, most people just say LaTeX or TeX. If you mean latex gloves, slang is rubber gloves. If you mean LaTeX document, people say Tex file. So slang term for natural latex is rubber or rubbers, for LaTeX software there is no common slang, just LaTeX or TeX, sometimes affectionately called the academic Word killer.