Buckfast was, and still remains a very potent drink. It’s a very cheap way of doing rather idiotic things and reaching a level of caffeine and alcohol mix that lends itself to university parties or clubbing. However it tastes absolutely awful past the first sip or two, with a flavour resembling cough syrup.
Fourloko seems to have a similar reputations with my friends from universities across the pond, but is a fair bit less alcoholic, and served in large beer can quantities rather than 750ml wine bottles. If you down a bottle of Bucky you’re having a night you probably won’t remember.