In some online correspondence this afternoon, a friend used the expression "the bomb", as in, "Kate, your new hockey blog, The Willful Caboose is the bomb!" (Okay, that's not exactly what he said. Truthfully, he didn't mention my blog at all. My point is simply that he said "the bomb".) I have a funny relationship with the expression "the bomb" particularly when I see it written out, because for years I wasn't sure if it was "the bomb", or "the balm".
Say them out loud.
"The bomb." "The balm."
I'm telling you, it could go either way.
To this day, I think the expression "the balm" makes more sense. Balm (as in, lip) really is the bomb.