A jagged or rugged array is when you have a non uniform array.
A 2 X 2 array will look like this
00 00
A rugged or jagged array might look like this.
00000 00 0000000 0000 00 0
This is achieved when defining the array. You mention that this is an array with 6 elements of depth but you add the width whenever you want with the new operator.