I have always assumed that since Fosters changed the formula for VB they also clandestinely changed what the VB stood for. Vomit Bombs! I'm not sure but I heard somewhere that they returned to the original recipe at some stage but once bombed, twice shy.
They did go back to the old recipe and increased the alcohol back to the old 4.9%. It has to be frosty cold or you get a funny metho type taste through it.