couple more that have come to mind for one reason or another.
Injections. We would say we're going for our jabs, I believe you guys refer to them as shots (which I associate with alcohol)
Loosely related ( as it can happen after consuming too much alcohol) is vomiting.
Typically we would say " I'm being sick" or "I've just been sick" however depending on company then you might also "chunder" ,"spew","barf", "make a pavement pizza", "puke", "throw up" or even say " I'm just going to answer/use the big white telephone"
WHat do you guys use?