A wall in this sense is referring to a very large amount of bitcoins on the ask or bid which is used to try to prevent the price of bitcoin from going higher (if its on the ask) or prevent it from going lower (if it's on the bid). When the price of bitcoin hits one of those "walls" of say 10,000 bitcoins and there's just not enough buying pressure of people trying to buy 10,000 bitcoins at that price it bounces and drives the price back down.
In the stock market world we call it "Stock blocking" :o
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