Abstract: Graphene at charge neutrality hosts a dense electron-hole excited state through which energy is expected to be transported with remarkable efficiency. In the transport regime characterized by frequent charge carrier collisions, this relativistic Dirac fluid violates the conventional Wiedemann-Franz law, flows as a viscous liquid of electrons, and exhibits an interparticle scattering rate limited by relativistic hydrodynamics to the shortest possible timescale for energy relaxation. Under photoexcitation, highly interacting electrons and holes are expected to cool beyond ordinary phonon-limited rates. While recent measurements are consistent with enhanced energy flow through doped graphene p-n junctions, unconventional ultrafast cooling in uniform intrinsic graphene remains elusive. Here, I will discuss rapid excited state quenching in the Dirac fluid transport regime of uniform, charge neutral graphene. Nanoscale photoexcitation thermometry is performed by sampling the out-of-plane transport of photoexcited hot carriers that originate in high-mobility graphene embedded within encapsulated graphene-hBN-graphene heterostructures. At intermediate lattice temperature T = 50 K, the electronic temperature Te is strongly quenched, exhibiting an intrinsic cooling rate that exceeds 1014 Kelvin/s within the first picosecond after photoexcitation. The extreme sensitivity of the Dirac plasma to lattice temperature and applied voltages indicates the onset of an anomalously efficient cooling regime, which we identify as a defining feature of the strongly interacting hot Dirac excited state.