Pulpy, soggy, or mashed; messy and squashed (often used for food or soft things made mushy).
子どもがケーキをぐちゃぐちゃにしてしまった。
The child made the cake all mushy/messy.
煮崩れて大根がぐちゃぐちゃになっている。
The daikon has boiled apart and become mushy.
Sloppy, untidy, or in disarray; chaotic or disorderly (can apply to rooms, explanations, plans, etc.).
部屋がぐちゃぐちゃで探し物が見つからない。
The room is a mess and I can't find what I'm looking for.
書類がぐちゃぐちゃに積まれている。
The documents are piled up in a disorganized mess.
説明がぐちゃぐちゃでよく分からない。
The explanation is messy and I don't really understand it.