Too Bus-y Dis-or-der / T-B-D (noun) 1. Stress-related illness that strikes individuals who over work and under relax. / 2. Symptoms include jargoning at the mouth, uncontrollable sweating, and in rare cases "giant thumbs" from overworking your digits while responding to text messages and emails on your smart phone. / 3. Also referred to as "Hand, Foot & Mouse" disease.