A person who is averse to personal hygiene. Specifically, someone who doesn't use a bath tub/seems afraid of water.
Look at him, he's a non-tubber! Not even the dogs will go near him!
Aussie slang for a person who doesnt wash him/herself, i.e. avoids the bath 'tub'.
Look at him! He's a Non-Tubber! I bet if you scrubbed his back long enough, you'd find his school bag!