What is the meaning of "mattaku" and "mattaku mo"?

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In English , it could be similar to "Seriously..." or "Seriously now....."

mattaku mo is more depressing in a way

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People use "mattaku" or "mattaku mou" when murmuring against something / someone. Just like the example sentense rjcorraya writed↑.

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Mattaku (まったく) means "at all", "totally" etc. For example, a few days ago when it was really really hot where I live, I learnt a phrase=> "mattaku unzaridesu" whick means "I am sick of it", "This really making me sick" etc...
However, I never heard 'mattaku mo' so I am hoping someone else will help you out ^_^

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