From the article:
This isn’t a new discovery, but it’s one many of us hadn’t heard of before, so we thought it worth sharing. If you’re in a situation where something is setting off your gag reflex [Ahem! — Bacchus] just form a fist with your left hand, squeezing your thumb. The folks over at Reddit’s Ask Science forum deliberate as to why this is, and they point to a 2008 study that shows it to be effective—not to mention lots of anecdotal evidence on the internet—but whether it’s an effect of the nerves in your hand or just a distraction, it looks like it’s a pretty useful trick.
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