To be referred to as moist is to say you are ill informed or have said something idiotic or embarrassing. Moist can also be used to describe a situation or occurrence. If someone is faced with a circumstance that is particularly displeasing it's also acceptable to say something like 'rahh that's moist'.
'I've got no friends man!'
'Allow that your bare moist'
'I can't man I'm going to my parents wedding'
The greatest word in the dictionary. Add to an innocent sentence to make it sound dirty. Double the pleasure by combining with words like panties and genitals. Moist is the perfect word to make others uncomfortable.
"That's so moist."
"Dude, unless you're describing cake, moist isn't very cool."