The Chokebot is a robotic arm developed and constructed by Doctor Krieger at ISIS; it is a powerful mechanical arm, with the strength to crush a billiard ball ("Dial M for Mother"). Dr. Krieger uses it to try to save his relationship with Cheryl who has a fetish for erotic asphyxiation, Krieger however can not choke her hard enough with his "weak womanly hands."
Doctor Krieger later attempts to sell the Chokebot along with other ISIS equipment and weapons for $41,688 to recoup the lost balance of his ISIS 401(k) ("Jeu Monégasque"). During this transaction, the Chokebot is seen fist-bumping one of the gang members.
The Chokebot is actually just a robotic arm for use in scientific laboratories and other purposes. This one got its name because of its use to satisfy Cheryl's desire for erotic asphyxiation.