I'm getting genuinely so tired of the same person trying to "follow" my account on multiple others. I don't know who this cretinous stalker is, but I do not like you, not one fucking bit; you bring me a sense of dread, and anger, and I want you to kindly piss off.
In the children's book "Sonic the Hedgehog: The Race Is On", Shadow can be seen saying the phrase "Dude, seriously?"
There is no deep lore behind this, it's just a funny thing to imagine Shadow say.