I’ve slipped in some Chinglish and now y’all are all slipped!
Probably this sign carries a bit of “wishful thinking” in that it “wishes” upon those who read it — a quick slip — so that you’re on the floor reading this.
Either that, or they got the tense and the grammar wrong.
What It Should Read: CAUTION! SLIPPERY FLOOR
Taken May 2011 in Beijing