snowball's chance in hell, a

a snowball's chance in hell

An infinitely small possibility, chance, or likelihood, to the point of being impossible. Usually used in the phrase "not have a snowball's chance in hell." That candidate doesn't have a snowball's chance in hell of winning an election in this part of the state. We haven't got a snowball's chance in hell if we have to compete against some mega corporation like that!
See also: chance, hell

snowball's chance in hell, a

No chance at all, as in He hasn't a snowball's chance in hell of getting there in two hours. This idiom, nearly always used negatively, alludes to the traditional view of hell as extremely hot, causing snow to melt at once. [Late 1800s]
See also: chance