Strap-on can refer to: Strap-on booster, a rocket motor which is used and then discarded Strap-on dildo, a sex toy Strap-on keyboard or "keytar", a keyboard instrument or MIDI controller that can be worn on a strap like a guitar Vortech Meg-2XH Strap-On, an American foot-launched helicopter design Strap, a term used to describe a gun