Say you are sideslipping so you have a clear view of the runway thru the pilot side window. You turn the yoke left, so left aileron up/right aileron down, that would start a left banked turn. Then you kick in right rudder to force the tail to move left and counter the left turn of the ailerons.  I do that all the time in my 177, it's a fun way to lose some altitude quick when you realize you're too high on final and don't want to float way down a short runway.

The amount of sideslip that results will depend on how much aileron and how much rudder is used.