Buy Wall can be best defined as a unique situation where large limit orders are placed to buy cryptocurrency at a certain value. It is yet another deception created by traders to create a fake impression on the market, probably preventing the cryptocurrency from falling further.
With demands outsmarting the supply, the limit order is bound to get executed. The sole purpose behind acquiring such a large amount of cryptocurrency is to create a bullish trend within the coin.
Price manipulation by whales is a huge concern, as they intend to create a fake public image for the given asset. This is where the buy wall is executed to make the asset appear healthier than it actually is.