福（fu）means good fortune, blessing, happiness.
So 福（fu）is associated with Chinese New Year and Chinese people always hang the printing of 福（fu）at the entrance of homes.
An interesting thing about the word 福 is that there is衣 一 口 田 in character 福（fu). 衣 means clothes, 一 口 means one, 田 means fields, that means there is sufficient food and clothes which is happiness. We all desire happiness, such as good health, longevity, prospering business.
Hence 福（fu）means that I wish you the best of luck and ever_increasing happiness as the years go by.