Mimetic adverb describing something being wet or damp, often with a sense of being thoroughly or unpleasantly wet. Used with verbs like 濡れる, 湿る, or なる.
My clothes got all wet from the rain.
My shirt is soaking wet with sweat.
Kana spelling is common for mimetic words and may be easier for learners.
Katakana spelling is sometimes used for emphasis or stylistic effect.
Reduplication of the stem 濡れ (from 濡れる, 'to get wet'), forming a mimetic adverb. The exact origin is uncertain, but it follows a common pattern for Japanese onomatopoeic/mimetic words.