  We explore a Portalino-like model of dark matter and neutrino masses in which
right-handed neutrino fields connect gauge neutral operators from the Standard
Model and Hidden Sector. Neutrino masses are generated via a seesaw-like
mechanism that can explain the light active neutrino masses. The model includes
a ``Portalino'' state that connects the two sectors via the neutrino portal.
Dark Matter in this model consists of a hidden sector Dirac fermion that
dominantly freezes-out via resonant annihilations into other hidden sector
states, which ultimately results in a population of Portalinos. Due to small
mixing in the extended neutrino sector these Portalinos tend to be
cosmologically long lived, decaying into Standard Model particles leading to
constraints on the model from Big Bang Nucleosynthesis and measurements of the
Cosmic Microwave Background radiation. Combining these limits with direct
constraints on the size of the Portalino-neutrino mixing and the assumptions of
the model the viable mass ranges for the Portalino states are found to be 0.02
eV $\lesssim m_n \lesssim$ 6.4 eV or 489 MeV $\lesssim m_n \lesssim$ TeV.
Indirect dark matter signals in the form of highly boosted, mono-energetic
Portalinos produced in Dark Matter annihilations provide a target for neutrino
telescopes.
