A rubber duckie vibrator is a waterproof vibrating sex toy that looks like a rubber duckie, a popular child's bath toy. Along with the classic yellow rubber duckie style, rubber duckie vibrators also come in a number of different styles and colors, including bondage rubber duckies and pink rubber duckies. Rubber duckie vibrators are popular because of their powerful vibrations and their ability to be left discreetly in the bathroom or bathtub.