#BinancePizza refers to "Bitcoin Pizza Day" on Binance, this cryptocurrency exchange platform. This date, May 22, commemorates the first real transaction of Bitcoin in real life, when Laszlo Hanyecz bought two pizzas for 10,000 BTC. Binance organizes events and activities to commemorate this day, including pizza deliveries and other community initiatives, as announced on its website.

In summary, #BinancePizza is a hashtag used by Binance to celebrate Bitcoin Pizza Day and the activities related to this date, including events, pizza deliveries, and other initiatives for the community, which takes place throughout the month of May.