ORIGINAL: charlie111
I call it as most people do as flying it in.It also keeps the airflow more stable adding power when landing.Remember to lower the wing on side that crosswind is comming from!Or it will flip your plane opposite rudder will have to be used to keep you straight.But with a little extra power the drag is minimal..If pushed to the extremes they call it crabbing and it helps if you come in high you can lower the nose and with airleron and rudder are opposite to the max it works like an airbrake helping you loose that extra altitude.
You are blending three concepts into one. Lowering the upwind wing is not crabbing. Most call this the "wing low" or "wing down" technique. Crabbing normally refers to letting the nose weather vane into the wind regardless of the ground trajectory of the plane. Lastly, "slipping" is what you addressed in your last sentence.
Kurt