Whack

whack \ˈwak\ noun: condition; state

Etymology: unknown (at least to me)

I purposefully left out all of whack’s definitions except the one that pertains to the phrase “out of whack.” Seen in this light it makes sense that something misaligned from its natural condition or state is “out of whack.” (Whack’s more common definition “a punch or strong blow” seems unrelated to “a condition or state,” but who knows? Stranger things have turned out to be true. If you can shed some light on this mess, please post a comment.