〜だらけ
covered in, full of (something unwanted)
Noun + だらけ (+ の Noun · + だ · + になる)
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だらけ says something is covered in or full of something, usually something unwelcome: 泥だらけ, "covered in mud"; 間違いだらけ, "full of mistakes"; 傷だらけ, "covered in cuts".
It attaches directly to a noun and works like a noun itself: 泥だらけになる, "get covered in mud"; ゴミだらけの部屋, "a room full of rubbish".
The feeling is negative and a bit messy. For good things, use いっぱい: 花がいっぱい, "full of flowers". 花だらけ sounds odd, as if the flowers were a nuisance.
Compare ばかり, "nothing but", which is about what there is, not about something being covered or spoiled.
Examples
子どもたちは泥だらけになって遊んだ。
The children played until they were covered in mud.
この作文は間違いだらけだ。
This essay is full of mistakes.
部屋がゴミだらけで、足の踏み場もない。
The room is so full of rubbish there's nowhere to step.
彼の手は傷だらけだった。
His hands were covered in cuts.
借金だらけの生活はもういやだ。
I'm sick of living up to my ears in debt.