The term 'TAW' is an acronym for the phrase 'Tiny Anxious Widdle', which is a popular nickname for the cartoon character, Sylvester the Cat's, sidekick, Tweety Bird. Tweety Bird is a yellow canary who appears in many of the Looney Tunes cartoons. He is often seen being chased by Sylvester, who is a large gray cat. The two characters have been featured in many classic cartoons since their first appearance in 1942.