fhsu Share definition Flag 1. fucking hella shit up2. fort hays state university "Aw shit man, today we fhsu" "Fuck yeah man, you know it.""FHSU FHSU FHSU" fhsu by bergatron August 16, 2012 0 0 Get merch Get the fhsu mug. Buy Now — $32.95 See more merch