  Strongly correlated phases in twisted bilayer graphene (TBG) typically arise
as transitions from a state in which the system behaves as a normal metal. In
such metallic regime, electron-electron interactions usually only play a
subleading role in transport measurements, compared to the dominant scattering
mechanism. Here, we propose and theoretically study an exception to this based
on a Coulomb drag setup between two metallic TBG, separated so that they only
couple through many-body interactions. We find that by solely varying the twist
angle equally in both TBG, the drag resistivity exhibits a unique maximum as
the system crossovers from a degenerate to a nondegenerate regime. When the
twist angles in each TBG differ, we find an anomalous drag resistivity
characterized by the appearance of multiple peaks. We show that this behavior
can be related to the dependence of the rectification function on the twist
angle.
