What is jibing?

Answer 1

I think you may mean Gybing, as opposed to Jibing.

Gybing is when the back of a boat passes through the wind, and changes the angle at which the wind comes onto a boat. Gybes are very quick, and the boom will swing across very fast, which can sometimes cause injury if you are not prepared. When sailing with the wind behind you, you should be very careful not to gybe accidently. Gybes can be initiated by bearing away hard until the back of the boat has gone through the wind.