Lol, open hands, palms inwards, "slight" pressure towards your eyes... ....What can I say, it worked at the time, no doubt this wouldn't work again, but all the usual tricks, e.g; holding breath, hanging upside down, etc. didn't work..
TBF, I always get diaphragmatic irritation when I either, drink too much, or eat very spicy food (or both)... when one guy
hiccup'd for 68 years, LMAO, I wasn't chancing it!