Fetching details from the dictionary...
viscous; mushy; pulpy; thick; slushy; syrupy; sticky
muddy; dirty (with oil, grease, etc.)
to be in an ugly state (of emotions, relations, etc.); to be murky; to be sordid
スープがどろどろになってしまった。
The soup became thick and mushy.
どろどろの泥が道に溜まっている。
Thick mud is pooling on the road.
どろどろした人間関係は疲れるね。
Messy human relationships are tiring, you know.