What does banana code mean?

banana code meaning in Urban Dictionary

(verb) to use 4011 at a self-service checkout machine to weigh out higher priced items at going price of bananas (typically $0.59/lb in 2013, future readers must adjust correctly for rising prices)(noun) the PLU (product look-up) rule for bananas; (noun) the amount 4011 that a shopper must used to weigh bananas within the self-service checkout aisle