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まっちろけなお弁当になっちゃった。 (context: it's lunch)
or
どれも、なんかまっちろけでさ。 (context: scene of an accident)
Does it have something to do with 真っ白, masshiro?
I think it may be some sort of obscure slang I don't know about, because I can't find any information on the internet and I don't see how pure white (masshiro) could apply to either of the examples.
「まっちろけ」 is indeed a colloquial and/or jocular way of saying 「真{ま}っ白{しろ}」, which means "pure/all white".
「まっちろけなお弁当{べんとう}」 would refer to a bento consisting of rice (which is white) and other things that are mostly very light-colored. Upon hearing that phrase, most Japanese-speakers would think of a visually unappetizing bento.
Finally, without more context or an explanation of the situation, I could not tell what 「どれも、なんかまっちろけでさ。」 might mean. It could mean that the speaker has a blurred memory of the accident, but I really should not be speculating. We do say 「頭の中が真っ白になる」 to mean "My mind went blank."
