  We study the transport properties of frustrated itinerant magnets comprising
localized {\it classical} moments, which interact via exchange with the
conduction electrons. Strong frustration stabilizes a liquidlike spin state,
which extends down to temperatures well below the effective
Ruderman-Kittel-Kasuya-Yosida interaction scale. The crossover into this state
is characterized by spin structure factor enhancement at wave vectors smaller
than twice the Fermi wave vector magnitude. The corresponding enhancement of
electron scattering generates a resistivity upturn at decreasing temperatures.
