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1.
a laugh that causes muscus and saliva that comes from the mouth or other places
Andrew: hahahahaha (foaming at the mouth)
David: Boy, that was a wet laugh
by andrew pan November 01, 2005
 
2.
The result from laughing so hard that the person can't control their bladder, they then pee on themselves. Mostly happens to women.
"Girlfriend that shit was so funny, I had a wet laugh!"
by Hoseby January 01, 2006