What is Bum Rum?
1.
a fruity alcoholic beverage favoured by shirt-lifters. Malibu or tia maria or some fudge-packer drink like that.
"ooooh quentin, shall we have a swift half?"
"oooh no barry, beer gives my fragile feminine stomach terrible upsets, lets just have a malibu eh?"
"hmmm me too. Two shots of bum rum, barman"
See