Your body isn’t trying to embarrass you at the worst possible moment (though it does a great job of it). That mouth-watering moment is a sign of a perfectly working, proactive body. It’s like a gladiator preparing for battle by chugging a sports drink.
Next time you feel that tingle, take a deep breath. Know that you are witnessing a masterpiece of biological engineering. Also, know that the best cure is to let it happen, rinse your mouth with water (not toothpaste—that’s a whole other horror story), and swear off crab rangoon for life.
In conclusion: your mouth waters before puking because your body is a smart, protective, slightly over-eager friend. It’s gross, it’s weird, and it’s weirdly fascinating. Now, if you’ll excuse me, I’m off to drink some ginger ale and reflect on the fact that I just wrote 750 words about spit and puke. You’re welcome.