It’s ta ta, toga parties.

Three Columbia University frat houses whose members were busted for alleged drug-dealing have been slapped with probation and a heave-ho from their university-owned digs, school officials said yesterday.

The boot comes after a probe of Pi Kappa Alpha, Psi Upsilon and Alpha Epsilon Pi, spurred by the arrest of five students living at the fraternities’ Morningside Heights brownstones for suspected distribution of cocaine, pot, ecstasy, Adderall and LSD.