I always thought that the term ‘double bagger’ was highly descriptive of a munter. One bag for her head and one for your own, just in case hers came off.
Also I was once told, that a particularly hefty BBW was a flour bagger, meaning that you was advised to carry a small bag of flour on assignations with her. After eight pints your aim might not be too good so out comes the bag of flour, sprinkle, sprinkle, and then aim for the wet bits.