Literally means "really" or "actually" or "in the strict sense of the word." Don't confuse it with figuratively, which means "in an analogous or metaphorical sense," not in the exact sense.
Very young children eat their books, literally devouring their contents. This is one reason for the scarcity of first editions of Alice in Wonderland and other favorites of the nursery."
(A. S. W. Rosenbach)
"The most important thing in art is the frame. For painting: literally; for other arts, figuratively--because, without this humble appliance, you can't know where The Art stops and The Real World begins."
Literally in the sense 'truly, completely' is a SLIPSHOD EXTENSION. . . . When used for figuratively, where figuratively would not ordinarily be used, literally is distorted beyond recognition..
(Bryan A. Garner, "literally" in Garner's Modern American Usage, Oxford University Press, 2003)