Acronym for "Cute Awkward Boy", referring to the type of guy, typically (but not necessarily) of the emo persuasion, whose presence almost demands an "AAWWWWW!"
Once a boy discovers he is a CAB, he may intentionally play up his awkward or goofy qualities and/or facial expressions so as to draw the attention of teenage girls.
girl 1: "I love Jack Barakat of All Time Low."
girl 2: "I know, he is such a CAB."
girl 1: "Did you see that CAB over by the merch table?"
girl 2: "I just wanted to grab him and pick him up like a baby!"