I'm thinkin' it might stem from the fragility of candy, how easily shattered it can be when dropped, or how it can melt in both wet environments and hot.
oh go out and play in the rain, have some fun! and stop being such a candy ass, your not gonna melt; you might even like it!
by k. sebastian November 15, 2007
(noun) A person who displays insufficient fortitude or toughness in a difficult or uncomfortable situation; by extension, a person or thing which is inadequate to the purpose at hand. Can be turned into an adjective by adding -ed ("candy-assed"). Frequently heard in the military.
"He was too much of a candy ass to do a hundred push-ups and run ten miles before breakfast."
by Anarcissie May 28, 2008