This study investigates spin-charge-lattice coupling across the charge density wave (CDW) transition in the Kagome lattice antiferromagnet FeGe using neutron scattering. FeGe exhibits a CDW order deep within its antiferromagnetic phase, interacting with magnetic order. Spin excitations below ~100 meV are described by a spin-1 Heisenberg Hamiltonian, while higher energy excitations are centered around the Brillouin zone boundary and extend up to ~180 meV, consistent with quasiparticle excitations across spin-polarized electron-hole Fermi surfaces. Spin wave dispersions and optical phonon modes show hardening below T_CDW due to spin-charge-lattice coupling, with no evidence of a phonon Kohn anomaly. Comparing experimental results with density functional theory calculations, FeGe is identified as a Hund's metal in the intermediate correlated regime, where magnetism arises from both itinerant and localized electrons. The strong spin-charge-lattice coupling in FeGe is distinct from FeSn and other kagome lattice materials, making it a unique system for studying intertwined spin, charge, and lattice degrees of freedom. The study reveals that high-energy spin excitations in FeGe are similar to those in other itinerant magnets, with quasiparticle excitations between spin-polarized electron-hole Fermi surfaces. The results suggest that FeGe is a rare case where the energy scales of spin, charge, and lattice degrees of freedom are similar, leading to exotic properties different from its sister compound FeSn and other known kagome lattice magnets.This study investigates spin-charge-lattice coupling across the charge density wave (CDW) transition in the Kagome lattice antiferromagnet FeGe using neutron scattering. FeGe exhibits a CDW order deep within its antiferromagnetic phase, interacting with magnetic order. Spin excitations below ~100 meV are described by a spin-1 Heisenberg Hamiltonian, while higher energy excitations are centered around the Brillouin zone boundary and extend up to ~180 meV, consistent with quasiparticle excitations across spin-polarized electron-hole Fermi surfaces. Spin wave dispersions and optical phonon modes show hardening below T_CDW due to spin-charge-lattice coupling, with no evidence of a phonon Kohn anomaly. Comparing experimental results with density functional theory calculations, FeGe is identified as a Hund's metal in the intermediate correlated regime, where magnetism arises from both itinerant and localized electrons. The strong spin-charge-lattice coupling in FeGe is distinct from FeSn and other kagome lattice materials, making it a unique system for studying intertwined spin, charge, and lattice degrees of freedom. The study reveals that high-energy spin excitations in FeGe are similar to those in other itinerant magnets, with quasiparticle excitations between spin-polarized electron-hole Fermi surfaces. The results suggest that FeGe is a rare case where the energy scales of spin, charge, and lattice degrees of freedom are similar, leading to exotic properties different from its sister compound FeSn and other known kagome lattice magnets.