Drifting with Rear Wheel Drive Manual

Find a car with both rear-wheel-drive and a manual transmission.

Head to an open area (i.e. an empty parking lot) safely free of pedestrians and motorists.
Shift Lock/Hand brake technique:

Accelerate and shift to second gear, which allows the widest variance of speed and is best for harnessing the engine's torque without overly stressing the mechanicals.

Push in the clutch to let the engine rev.

With the engine revving, flick the steering wheel to the outside of the turn and steer strongly inside toward the turn.

Simultaneously release the clutch. (If you are uncomfortable with this method of sliding, try pulling the hand brake to further reduce traction(never pull brake while accelerating). While that won't kill your car initially, it is a bad habit to get into. Don't start now.)

Immediately steer the car in the direction of the slide. You're drifting!