The phrases come from Bluudude material connected to PBBV, where the character's arrival is treated as a running joke in the line 'Bluudude's comin for you'. As a short soundboard clip, the watching and here lines were lifted out of that longer context and shared on their own, making them easy to drop into edits without explanation. Their appeal has lasted because the wording is simple, instantly repeatable and works both as a genuine warning and as an inside joke, so new viewers can grasp the threat while returning fans recognise the reference.