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We present a fast and efficient method to compute the inclusive two-particletwo-hole (2p-2h) electroweak responses in the neutrino and electronquasielastic inclusive cross sections. The method is based on twoapproximations. The first neglects the motion of the two initial nucleons belowthe Fermi momentum, which are considered to be at rest. This approximation,which is reasonable for high values of the momentum transfer, turns out also tobe quite good for moderate values of the momentum transfer $q\gtrsim k_F$. Thesecond approximation involves using in the "frozen" meson-exchange currents(MEC) an effective $\Delta$-propagator averaged over the Fermi sea. Within theresulting "frozen nucleon approximation", the inclusive 2p-2h responses areaccurately calculated with only a one-dimensional integral over the emissionangle of one of the final nucleons, thus drastically simplifying thecalculation and reducing the computational time. The latter makes this methodespecially well-suited for implementation in Monte Carlo neutrino eventgenerators.

The frozen nucleon approximation in two-particle two-hole response functions