No sprechen sie Dumb but I'm real, real good
“No sprechen sie” actually makes no sense at all in German. “No” is not a German word and “sprechen sie” either means “they speak” or “you speak”.
While he probably means “Nah… I don’t speak Dumb, but I’m real, real good,” it doesnt really matter whether his German is correct or not, since he doesn’t speak it :–)
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