The larva of a botfly, which infests the skin of various mammals, producing warbles, or the nasal passage of sheep, or the stomach of horses.
A physical robot.
A piece of software designed to perform a minor but repetitive task automatically or on command, especially when operating with the appearance of a (human) user profile or account.
A computer-controlled character in a video game, especially a multiplayer one.
A supremely unskilled player.