Muddy Water
noun
Mud water is muddy water. Don't step in it, if you can help it.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
「ちょっと！今私の雑誌にコーヒーをこぼしたでしょ？」「ああ、ごめん！悪かったよ。」「あ〜ぁ〜…ジョニーデップの股間のところに泥水みたいな染みができちゃったじゃない！」
"Hey! Did you spill coffee on my magazine?" "Ah, sorry! My bad!" "Aww... now it looks like there is a muddy water stain right on Johnny Depp’s crotch."