Never heard that word. It must be an across- the- pond expression. I have heard Joy Stick in this context, but now that also is a term gamers use for that stick that navigates the players or whatever it does.
When I was a teenager, one of my friends told me (jokingly) that joss-sticks were called dildos, and I went along with it just for a laugh. It became an in-joke among us for a while. Years later I heard one or two girls calling a penis a joystick. I won't go into any more detail about that because this isn't the adult section. Lol:)