The word literally means in a literal sense. You know, as opposed to a figurative sense.
Snooty grammarians love to call people out for overusing the word. Is your skin literally going to melt because it's so hot out? Probably not. Unless you're the Wicked Witch of the West, in which case, you've used the word correctly.
And while it makes for really good humor, we're obliged to tell you to avoid using it for emphasis.