covered with water or another liquid
wet hair/grass/clothes
You’d better come in or you’ll get wet.
wet with: Her forehead was wet with sweat.
soaking/sopping/dripping wet (=very wet): My socks and shoes were soaking wet.
all wet: The baby needs a dry nappy-this one’s all wet.
wet through (=completely wet): Where have you been? You’re wet through!