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An expression which comes from writing the sentence "Calm the fuck down" as if it were French: "Comme" for Calm, "de" for the, and Fuckdown altogether. It is probably trying to make fun of both English slang (da/de used for "the") and French language (or, of French people that don't know how to write English properly).

The expression "Comme de Fuckdown" was made popular by a Dutch apparel company producing caps, t-shirt and goodies displaying that sentence.
What is this "Comme de Fuckdown" everyone is wearing? - Don't know dude, some Dutch company.

I'm going to freak out... - Comme de Fuckdown (Calm the fuck down)
by BBB's cube September 16, 2013