(Adj.) Originated in Glendale, California, hella wet means very cool, hip, or great. Hella wet can also be a sign of agreement, similar a hearty "yeah!", and used in place of "stoked" or "excited" when describing oneself..
"Dude this book is hella wet."
"Yeah dude, I'm totally digging it."
"Damn man, this show is great!"
"Yeah dude, hella wet!"
"I'm so excited for ice cream."
"Yeah I'm hella wet."
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