Covered in with 〜だらけ
Grammar: Condition
A noun followed by だらけ it means something is “covered in” or “filled with” that noun, which is something undesirable.
だらけ may be followed by の then the item covered, but this may be excluded when the item is obvious.
This is used for things covering in a scattered way.
Examples
Covered in books with 〜だらけ

Upon hearing Usami say she’s stopping by the school library, Uchimaki says he wants with, and Colette tags along.
- 内巻:
- 「本だらけだ!!」
- “It's nothing but books!!”
- コレット:
- 「本屋さんみたいだ!!」
- “It's like a book store!!”
- 宇佐美:
- 「2人とも静にしなさい」
- “Quiet down, you two.”
Filled with carelessness with 〜だらけ

Realizing Urushi is hiding in a box to try and scare him, Ayumu sits with his back to the box.
- 歩:
- 「どうですか?油断だらけのこの背中…」
- “How is it? This back filled with carelessness.”
Filled with dinosaurs with 〜だらけ

Kotoha, Yui, and Sacchan enter another exhibit room in the museum.
- ○:
- 「恐竜だらけだーー!」
- “It's full of dinosaurs!”