"Wet" tuning is usually applied to free reed instruments such as the accordion or harmonica. When selecting a note (by pushing a key, blowing in a hole, etc.) activates two or more reeds, which are technically the same note and therefore the same pitch, one of the reeds can be tuned slightly flat or sharp from "concert pitch." This means that the two reeds vibrate slightly "out of phase," producing a vibrato effect as the sound waves alternately coincide and differ.
If you listen to a Hohner Echo Harp harmonica, or another brand of "echo harmonica," you will hear "wet" tuning:
Not so great musically, but you get the idea.
Tuning a mandolin "wet" would mean not tuning the two strings of a course in exact unison pitch, but tuning one slightly sharp or flat. Few find this enjoyable, but hey! you're welcome to try it.
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