Moist meaning : To moisten. Slightly wet; characterised by the presence of moisture, not dry; damp. Of eyes: tearful, wet with tears. Of weather, climate etc.: rainy, damp. Pertaining to one of the four essential qualities formerly believed to be present in all things, characterised by wetness. Watery, liquid, fluid. Characterised by the presence of pus, mucus etc. Sexually lubricated (of the vagina); sexually aroused, turned on (of a woman).