I think it's the same as in this reddit post where others describe it: https://www.reddit.com/r/DAE/comments/1hw4xx3/dae_ever_get_a...
I always assumed it was the saliva glands going into overdrive.
I didn't think/realize it was limited to salty things, to me it was connected to things I really like.
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I think it's the same as in this reddit post where others describe it: https://www.reddit.com/r/DAE/comments/1hw4xx3/dae_ever_get_a...