Dongbot is a slang term for a vibrator - the most rudimentary form of a sexbot or fuckbot. Such devices don't have enough personality to even approach being a lovebot, though rumors persist of many women falling in love with their Jack Rabbits, Red Demons, Black Daddys, and even special showerheads -- all devices designed to maximize female orgasm.more...
A plain dildo is kind of like a dead vibrator, but could also qualify as a dongbot.
By extension, a dongbot could also be a replica of female sex parts used by men. Usually such devices have 1 to 3 orifices with only a little context surrounding the holes. Like just a face, with eyes, nose, and a fuckable mouth, period. Or some female porn star's crotch, just the crotch, nothing else, no belly, no legs, just 2 holes and maybe some fur. You can see these on the sex toy sites. The less body the more the device is a dongbot. In this respect the penile pump is the ultimate dongbot for males, having no body parts except for a sucking slidy orifice.