We can also add additional dribble to our Icing by using the Extrude feature.

Extruding: This is when you extend a selected face or profile along a specified path to add depth, effectively transforming it into a three-dimensional shape. This technique is fundamental in constructing complex geometries

Simple select two verticies along the bottom of our Icing's waves and press the 'e' key. Then drag down to create a nice long dribble. You can click to release once you've reached your desired length.