Pertaining to a life you concoct during your lunch hour that is more rich and full than the one you lead otherwise. A fulfilling lunchlife would include get-togethers with interesting friends and acquaintances, shopping sprees, gallery shows, and visits to places that one would not go to at any other time due to life constraints such as spouse and family obligations.
He has a fabulous lunchlife because of that great expense account.
He went to the book signing with his his supermodel client. What a lunchlife he has!