When one eats an excessive amount of lettuce, chewed properly, which is then spewed out in diarrheal form... Resulting in what appears to be sea monkies floating in the toilet bowl.
incredibly cold, freezing in fact.
derived from the saying 'it's cold enough to freeze the bollocks of a brass monkey' it would need to be incredlibly cold to bring brass to a point where it would just become so brittle it broke away