To eject a seemingly extra object from one's bicycle in an attempt to make it more aerodynamic or lighter.
Not to be confused with accidentally ejecting one's nutrition.
Triathlete 1: Did you see that guy JackMott his water bottle?
Triathlete 2: That's Jack Mott - he's obsessed with all things aero, so he must think that JackMotting his between-the-aerobars nutrition will make him more aerodynamic.
Triathlete 1: Even 5 minutes into the race? I don't know...this is Captex '11...a notoriously tough race.
Triathlete 2: We'll see how he does.