A Mr. Hyde like creature which comes out to play after the excessive consumption of rum.
If a Rum-Billie is seen. Run.
Rum-Billies are particularly fierce to small, hungry girls. They may be put in their place with a harshly-toned 'NO!'.
"Billie, smile for the camera!"
"YOU'RE MUMS ON CAMERA! ITS CALLED FANNY-CAM! You should watch, its quality viewing."
"NO, Rum-Billie!! Get back in your fucking box!!"