The term "
One Bomb" is very commonly used when drinking alcohol, it refers to driking ones
alcoholic beverage in "
one" i.e "One Bomb". Whenever this phrase is used, the person it is aimed at has to drink the whole content of their glass/bottle all at once otherwise they are then known as a bailer.
The phrase derives from a small town called rochdale in England where lots of "one Bombing" happens.