A previously unreported isomer has been identified in $^{99}\mathrm{Mo}$ at an excitation energy of ${E}_{x}=3010$ keV, decaying with a half-life of ${T}_{1/2}=8(2)$ ns. The nucleus of interest was produced following fusion-fission reactions between a thick $^{27}\mathrm{Al}$ target frame and a $^{178}\mathrm{Hf}$ beam at a laboratory energy of 1150 MeV. This isomeric state is interpreted as an energetically favored, maximally aligned configuration of $$ν${}{h}_{\frac{11}{2}}$\bigotimes${}$π${}({g}_{\frac{9}{2}}){}^{2}$.